Find centralized, trusted content and collaborate around the technologies you use most. Expressions (EXP), https://samate.nist.gov/SSATTM_Content/papers/Seven%20Pernicious%20Kingdoms%20-%20Taxonomy%20of%20Sw%20Security%20Errors%20-%20Tsipenyuk%20-%20Chess%20-%20McGraw.pdf, https://www.microsoftpressstore.com/store/writing-secure-code-9780735617223, Cybersecurity and Infrastructure Security Agency, Homeland Security Systems Engineering and Development Institute, Detect and handle standard library errors, The CERT Oracle Secure Coding Standard for Java (2011), Provided Demonstrative Example and suggested CERT reference, updated Common_Consequences, Relationships, Other_Notes, Taxonomy_Mappings, updated Background_Details, Demonstrative_Examples, Description, Observed_Examples, Other_Notes, Potential_Mitigations, updated Common_Consequences, Demonstrative_Examples, References, updated Demonstrative_Examples, Potential_Mitigations, References, updated Demonstrative_Examples, References, updated Common_Consequences, Demonstrative_Examples, Relationships, Taxonomy_Mappings, updated Common_Consequences, References, Relationships, updated Demonstrative_Examples, Potential_Mitigations, updated Demonstrative_Examples, Relationships, Taxonomy_Mappings, updated Applicable_Platforms, References, Relationships, Taxonomy_Mappings, updated References, Relationships, Taxonomy_Mappings, updated Demonstrative_Examples, Observed_Examples, Relationships, Weakness_Ordinalities. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore. JS Strong proficiency with Rest API design implementation experience. NULL pointer dereferences are frequently resultant from rarely encountered error conditions, since these are most likely to escape detection during the testing phases. The Optional class contains methods that can be used to make programs shorter and more intuitive [].. For Benchmark, we've seen it report it both ways. java"HP Fortify v3.50""Null Dereference"Fortifynull. It works under 64-bit systems in Windows, Linux and macOS environments, and can analyze source code intended for 32-bit, 64-bit and embedded ARM platforms. "Sin 11: Failure to Handle Errors Correctly." Requirements specification: The choice could be made to use a <. The same occurs with the presence of every form in html/jsp (x)/asp (x) page, that are suspect of CSRF weakness. This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. Mature pregnant Mom ass fucked by horny Stepson, Perfect Pussy cant Stop Squirting all over herself, Shokugeki no Soma Todokoro Megumi Hard Sex, naughty teen in sexy lace lingerie dancing and seducing boy sucking him and riding him hard amateur, Slutty wife Jayla de Angelis gets assfucked by the hung doctor in POV. This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. I believe this particular behavior is a gap in the Fortify analyzer implementation, as all other static analysis tools seem to understand the code flow and will not complain about potential null references in this case. How do I generate random integers within a specific range in Java? Just about every serious attack on a software system begins with the violation of a programmer's assumptions. About an argument in Famine, Affluence and Morality. So mark them as Not an issue and move on. Why are trials on "Law & Order" in the New York Supreme Court? ImmuniWeb. I got Fortify findings back and I'm getting a null dereference. When this method is called by a thread that is not the owner, the return value reflects a best-effort approximation of current lock status. Share Improve this answer Follow edited Jun 4, 2019 at 17:08 answered Jun 4, 2019 at 17:01 Thierry 5,170 33 39 "Writing Secure Code". The program can potentially dereference a null-pointer, thereby raising a NullPointerException. But the stream and reader classes do not consider it unusual or exceptional if only a small amount of data becomes available. Anyone have experience with this one? Since the code does not check the return value from gethostbyaddr (CWE-252), a NULL pointer dereference (CWE-476) would then occur in the call to strcpy(). Server allows remote attackers to cause a denial of service (crash) via malformed requests that trigger a null dereference. [1] Standards Mapping - Common Weakness Enumeration, [2] Standards Mapping - Common Weakness Enumeration Top 25 2019, [3] Standards Mapping - Common Weakness Enumeration Top 25 2020, [4] Standards Mapping - Common Weakness Enumeration Top 25 2021, [5] Standards Mapping - Common Weakness Enumeration Top 25 2022, [6] Standards Mapping - DISA Control Correlation Identifier Version 2, [7] Standards Mapping - General Data Protection Regulation (GDPR), [8] Standards Mapping - NIST Special Publication 800-53 Revision 4, [9] Standards Mapping - NIST Special Publication 800-53 Revision 5, [10] Standards Mapping - OWASP Top 10 2004, [11] Standards Mapping - OWASP Application Security Verification Standard 4.0, [12] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1, [13] Standards Mapping - Security Technical Implementation Guide Version 3.1, [14] Standards Mapping - Security Technical Implementation Guide Version 3.4, [15] Standards Mapping - Security Technical Implementation Guide Version 3.5, [16] Standards Mapping - Security Technical Implementation Guide Version 3.6, [17] Standards Mapping - Security Technical Implementation Guide Version 3.7, [18] Standards Mapping - Security Technical Implementation Guide Version 3.9, [19] Standards Mapping - Security Technical Implementation Guide Version 3.10, [20] Standards Mapping - Security Technical Implementation Guide Version 4.1, [21] Standards Mapping - Security Technical Implementation Guide Version 4.2, [22] Standards Mapping - Security Technical Implementation Guide Version 4.3, [23] Standards Mapping - Security Technical Implementation Guide Version 4.4, [24] Standards Mapping - Security Technical Implementation Guide Version 4.5, [25] Standards Mapping - Security Technical Implementation Guide Version 4.6, [26] Standards Mapping - Security Technical Implementation Guide Version 4.7, [27] Standards Mapping - Security Technical Implementation Guide Version 4.8, [28] Standards Mapping - Security Technical Implementation Guide Version 4.9, [29] Standards Mapping - Security Technical Implementation Guide Version 4.10, [30] Standards Mapping - Security Technical Implementation Guide Version 4.11, [31] Standards Mapping - Security Technical Implementation Guide Version 5.1, [32] Standards Mapping - Web Application Security Consortium 24 + 2, [33] Standards Mapping - Web Application Security Consortium Version 2.00, desc.controlflow.dotnet.missing_check_against_null, desc.controlflow.java.missing_check_against_null, (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. The stream and reader classes do not consider it to be unusual or exceptional if only a small amount of data becomes available. Category:Code Quality The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. corrected in a simple way. Added Fortify's analysis trace, which is showing that the dereference of sortName is the problem. Note that this code is also vulnerable to a buffer overflow . Unfortunately our Fortify scan takes several hours to run. Browse other questions tagged java fortify or ask your own question. Addison Wesley. Use of the Common Weakness Enumeration (CWE) and the associated references from this website are subject to the Terms of Use. rev2023.3.3.43278. which best describes the pillbugs organ of respiration; jesse pearson obituary; ion select placeholder color; best fishing spots in dupage county This can cause DoDangerousOperation() to operate on an unexpected value. If an attacker provides an address that appears to be well-formed, but the address does not resolve to a hostname, then the call to gethostbyaddr() will return NULL. environment so that cmd is not defined, the program throws a null When it comes to these specific properties, you're safe. The modules cover the full breadth and depth of topics for PCI Section 6.5 compliance and the items that are important for secure software development. Anything that requires dynamic memory should be buried inside an RAII object that releases the memory when it goes out of scope. Closed; is cloned by. set them to NULL once they are freed: If you are working with a multi-threaded or otherwise asynchronous . "Automated Source Code Security Measure (ASCSM)". Thanks for the input! How can we prove that the supernatural or paranormal doesn't exist? But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. Network Operations Management (NNM and Network Automation). Is this from a fortify web scan, or from a static code analysis? Dynamic analysis is a great way to uncover error-handling flaws. The program can dereference a null-pointer because it does not check the return value of a function that might return null. Availability: Null-pointer dereferences invariably result in the rev2023.3.3.43278. If there is a more properplace to file these types of bugs feel free to share and I'll proceed to file the bug there. Note that this code is also vulnerable to a buffer overflow (CWE-119). It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. In this case, the caller abuses the callee API by making certain assumptions about its behavior (that the return value can be used for authentication purposes). Redundant Null Check. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. 2006. This user is already logged in to another session. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It doesn't matter whether I handle the error or allow the program to die with a segmentation fault when it tries to dereference the null pointer." The program can dereference a null-pointer because it does not check the return value of a function that might return null. operator is the logical negation operator. OS allows remote attackers to cause a denial of service (crash from null dereference) or execute arbitrary code via a crafted request during authentication protocol selection. is incorrect. Take the following code: Integer num; num = new Integer(10); However, its // behavior isn't consistent. Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. Fortify is complaining about a Null Dereference when I set a field to null: But that seems really silly. When you assign the value of 10 on the second line, your value of 10 is written into the memory location referred to by x. Ie, do you want to know how to fix a vulnerability (this is well-covered, and you should do some research before asking a more concrete question), or do you want to know how to suppress a false-positive (this would likely be off-topic, you should just ask the vendor)? What is the point of Thrower's Bandolier? For example, the owner may be momentarily null even if there are threads trying to acquire the lock but have not yet done so . Without handling the error, there is no way to know. In rare circumstances, when NULL is equivalent to the 0x0 memory address and privileged code can access it, then writing or reading memory is possible, which may lead to code execution. Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') -Wnull-dereference. Copyright 20062023, The MITRE Corporation. The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; while may produce spurious null dereference reports. Here is a code snippet: getAuth() should not return null. <, [REF-961] Object Management Group (OMG). A check-after-dereference error occurs when a program dereferences a pointer that can be, [1] Standards Mapping - Common Weakness Enumeration, [2] Standards Mapping - Common Weakness Enumeration Top 25 2019, [3] Standards Mapping - Common Weakness Enumeration Top 25 2020, [4] Standards Mapping - Common Weakness Enumeration Top 25 2021, [5] Standards Mapping - Common Weakness Enumeration Top 25 2022, [6] Standards Mapping - DISA Control Correlation Identifier Version 2, [7] Standards Mapping - General Data Protection Regulation (GDPR), [8] Standards Mapping - Motor Industry Software Reliability Association (MISRA) C Guidelines 2012, [9] Standards Mapping - NIST Special Publication 800-53 Revision 4, [10] Standards Mapping - NIST Special Publication 800-53 Revision 5, [11] Standards Mapping - OWASP Top 10 2004, [12] Standards Mapping - OWASP Application Security Verification Standard 4.0, [13] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1, [14] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0, [15] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1, [16] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2, [17] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1, [18] Standards Mapping - Payment Card Industry Software Security Framework 1.0, [19] Standards Mapping - Payment Card Industry Software Security Framework 1.1, [20] Standards Mapping - Security Technical Implementation Guide Version 3.1, [21] Standards Mapping - Security Technical Implementation Guide Version 3.4, [22] Standards Mapping - Security Technical Implementation Guide Version 3.5, [23] Standards Mapping - Security Technical Implementation Guide Version 3.6, [24] Standards Mapping - Security Technical Implementation Guide Version 3.7, [25] Standards Mapping - Security Technical Implementation Guide Version 3.9, [26] Standards Mapping - Security Technical Implementation Guide Version 3.10, [27] Standards Mapping - Security Technical Implementation Guide Version 4.1, [28] Standards Mapping - Security Technical Implementation Guide Version 4.2, [29] Standards Mapping - Security Technical Implementation Guide Version 4.3, [30] Standards Mapping - Security Technical Implementation Guide Version 4.4, [31] Standards Mapping - Security Technical Implementation Guide Version 4.5, [32] Standards Mapping - Security Technical Implementation Guide Version 4.6, [33] Standards Mapping - Security Technical Implementation Guide Version 4.7, [34] Standards Mapping - Security Technical Implementation Guide Version 4.8, [35] Standards Mapping - Security Technical Implementation Guide Version 4.9, [36] Standards Mapping - Security Technical Implementation Guide Version 4.10, [37] Standards Mapping - Security Technical Implementation Guide Version 4.11, [38] Standards Mapping - Security Technical Implementation Guide Version 5.1, [39] Standards Mapping - Web Application Security Consortium 24 + 2, [40] Standards Mapping - Web Application Security Consortium Version 2.00. For Benchmark, we've seen it report it both ways. Alle rechten voorbehouden. String os = System.getProperty ("os.name"); if (os.equalsIgnoreCase ("Windows 95") ) System.out.println ("Not supported"); The SAST tool used was Fortify SCA, (and obviously if httpInputStream is different from null, to avoid a possible Null Dereference by invoking the close() method). They will always result in the crash of the <, [REF-18] Secure Software, Inc.. "The CLASP Application Security Process". But, when you try to declare a reference type, something different happens. Expressions (EXP), SEI CERT C Coding Standard - Guidelines 03. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. When you assign the value of 10 on the second line, your value of 10 is written into the memory location referred to by x. case " Null Dereference ": return 476; // Fortify reports weak randomness issues under Obsolete by ESAPI, rather than in // the Insecure Randomness category if it thinks you are using ESAPI. The program can dereference a null-pointer because it does not check the return value of a function that might return null. Deerlake Middle School Teachers, Most null pointer Compliance Failure. How do I convert a String to an int in Java? In the following code, the programmer assumes that the system always has a property named "cmd" defined. Depending upon the type and size of the application, it may be possible to free memory that is being used elsewhere so that execution can continue. "Security problems caused by dereferencing null . Can archive.org's Wayback Machine ignore some query terms? Here is a code snippet: public class Example { private Collection<Auth> Authorities; public Example (SomeUser user) { for (String role: user.getAuth ()) { //This is where Fortify gives me a null dereference Authorities.add (new Auth (role)); } } private List<String> getAuth () { return null; } } java fortify Share Improve this question attacker can intentionally trigger a null pointer dereference, the The following code shows a system property that is set to null and later dereferenced by a programmer who mistakenly assumes it will always be defined. Instead use String.valueOf (object). failure of the process. and John Viega. If you can guaranty this, then the empty List is even better, as it does not create a new object all the time. [1] J. Viega, G. McGraw Building Secure Software Addison-Wesley, [2] Standards Mapping - Common Weakness Enumeration, [3] Standards Mapping - Common Weakness Enumeration Top 25 2019, [4] Standards Mapping - Common Weakness Enumeration Top 25 2020, [5] Standards Mapping - Common Weakness Enumeration Top 25 2021, [6] Standards Mapping - Common Weakness Enumeration Top 25 2022, [7] Standards Mapping - DISA Control Correlation Identifier Version 2, [8] Standards Mapping - General Data Protection Regulation (GDPR), [9] Standards Mapping - NIST Special Publication 800-53 Revision 4, [10] Standards Mapping - NIST Special Publication 800-53 Revision 5, [11] Standards Mapping - OWASP Top 10 2004, [12] Standards Mapping - OWASP Application Security Verification Standard 4.0, [13] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1, [14] Standards Mapping - Security Technical Implementation Guide Version 3.1, [15] Standards Mapping - Security Technical Implementation Guide Version 3.4, [16] Standards Mapping - Security Technical Implementation Guide Version 3.5, [17] Standards Mapping - Security Technical Implementation Guide Version 3.6, [18] Standards Mapping - Security Technical Implementation Guide Version 3.7, [19] Standards Mapping - Security Technical Implementation Guide Version 3.9, [20] Standards Mapping - Security Technical Implementation Guide Version 3.10, [21] Standards Mapping - Security Technical Implementation Guide Version 4.1, [22] Standards Mapping - Security Technical Implementation Guide Version 4.2, [23] Standards Mapping - Security Technical Implementation Guide Version 4.3, [24] Standards Mapping - Security Technical Implementation Guide Version 4.4, [25] Standards Mapping - Security Technical Implementation Guide Version 4.5, [26] Standards Mapping - Security Technical Implementation Guide Version 4.6, [27] Standards Mapping - Security Technical Implementation Guide Version 4.7, [28] Standards Mapping - Security Technical Implementation Guide Version 4.8, [29] Standards Mapping - Security Technical Implementation Guide Version 4.9, [30] Standards Mapping - Security Technical Implementation Guide Version 4.10, [31] Standards Mapping - Security Technical Implementation Guide Version 4.11, [32] Standards Mapping - Security Technical Implementation Guide Version 5.1, [33] Standards Mapping - Web Application Security Consortium 24 + 2, [34] Standards Mapping - Web Application Security Consortium Version 2.00, desc.controlflow.cpp.missing_check_against_null. ASCSM-CWE-252-resource. Many modern techniques use data flow analysis to minimize the number of false positives. Abstract. The choice could be made to use a language that is not susceptible to these issues. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. The issue is that if you take data from an external source, then an attacker can use that source to manipulate your path. java.util.Collections.emptyList() should only be used, if you are sure that every caller of the method does not change the list (does not try to add any items), as this would fail on this unmodifiable List. 10 Avoiding Attempt to Dereference Null Object Errors - YouTube 0:00 / 8:00 10 Avoiding Attempt to Dereference Null Object Errors 4,029 views Oct 22, 2014 In this episode we look at 3 common. null. issues result in general software reliability problems, but if an Use of the Common Weakness Enumeration (CWE) and the associated references from this website are subject to the Terms of Use. Apple. public class MyClass {. If it does not exist, the program cannot perform the desired behavior so it doesn't matter whether I handle the error or allow the program to die dereferencing a null value." "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". How to will fortify scan in eclipse Ace Madden. We set fields to "null" in many places in our code and Fortify is good with that. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. Null pointer errors are usually the result of An awesome tip to avoid NPE is to return empty When it comes to these specific properties, you're safe. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Thank you for visiting OWASP.org. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. We nemen geen verantwoordelijkheid voor de inhoud van een website waarnaar we linken, gebruik je eigen goeddunken tijdens het surfen op de links. Most null pointer issues result in general software reliability problems, but if attackers can intentionally trigger a null pointer dereference, they can use the resulting exception to bypass security logic or to cause the application to reveal debugging information that will be valuable in planning subsequent attacks. Alle links, video's en afbeeldingen zijn afkomstig van derden. The Null dereference error was on the line of code sortName = lastName; not the call of the setter : fortify do not want you to conditionnally change the value of a variable that was set to null without doing so in all the branches. citrus county livestock regulations; how many points did klay thompson score last night. Making statements based on opinion; back them up with references or personal experience. A Pillar is different from a Category as a Pillar is still technically a type of weakness that describes a mistake, while a Category represents a common characteristic used to group related things. Connect and share knowledge within a single location that is structured and easy to search. Chain - a Compound Element that is a sequence of two or more separate weaknesses that can be closely linked together within software. High severity (3.7) NULL Pointer Dereference in java-1.8.-openjdk-accessibility | CVE-2019-2962 More information is available Please select a different filter. "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". A Community-Developed List of Software & Hardware Weakness Types, Technical Impact: DoS: Crash, Exit, or Restart, Technical Impact: Execute Unauthorized Code or Commands; Read Memory; Modify Memory. Disclaimer: we hebben een nultolerantiebeleid tegen illegale pornografie. Fix: Added if block around the close call at line 906 to keep this from being . Enter the username or e-mail you used in your profile. I think I know why I'm getting it , just wanted to know what would be the best way to fix the issue. CWE is sponsored by the U.S. Department of Homeland Security (DHS) Cybersecurity and Infrastructure Security Agency (CISA) and managed by the Homeland Security Systems Engineering and Development Institute (HSSEDI) which is operated by The MITRE Corporation (MITRE). PVS-Studio is a tool for detecting bugs and security weaknesses in the source code of programs, written in C, C++, C# and Java. ASCRM-CWE-252-resource. Giannini Guitar Model 2, This website uses cookies to analyze our traffic and only share that information with our analytics partners. process, unless exception handling (on some platforms) is invoked, and Avoid Returning null from Methods. Connection conn = null; Boolean myConn = false; try { if (conn == null) { conn = DatabaseUtil.getConnection (); myConn = true; } result = DbClass.getObject (conn, otherParameters); }catch (DatabaseException de) { throw de; }catch (SQLException sqle) { throw new DatabaseException ("Error Message"); }finally { if (myConn && conn != null) { try { Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. Program does not check return value when invoking functions to drop privileges, which could leave users with higher privileges than expected by forcing those functions to fail. Category:Vulnerability. This way you initialize sortName only once, and explicitely show that a null value is the right one in some cases, and not that you forgot some cases, leading to a var staying null while it is unexpected. Unchecked return value leads to resultant integer overflow and code execution. how to fix null dereference in java fortify how to fix null dereference in java fortify . Making statements based on opinion; back them up with references or personal experience. "The Art of Software Security Assessment". Cookie Security. <. This way you initialize sortName only once, and explicitely show that a null value is the right one in some cases, and not that you forgot some cases, leading to a var staying null while it is unexpected. The Java VM sets them so, as long as Java isn't corrupted, you're safe. If I had to guess, the tool you're using is complaining about our use of Math.random() but we don't rely on it being cryptographically secure. . Example . 2. This also passes Fortify's scan: Thanks for contributing an answer to Stack Overflow! Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers). language that is not susceptible to these issues. If you preorder a special airline meal (e.g. A force de persvrance et de courage, la petite fourmi finit par arriver au sommet de la montagne. I'm using "HP Fortify v3.50" on a java project and I find lots of false positive on "Null Dereference", because Fortify doesn't see the control against null is in another method. Description. Chapter 20, "Checking Returns" Page 624. 3 FortifyJava 8 - Fortify : Null dereference for Java 8 Java 8 fortify Null Dereference null When working on a few Null Dereferencing warnings from Fortify, I was wondering if we could use standard .Net CodeContracts clauses to help Fortify in figuring out the exceptions. 856867 Defect: The method prettyPrintXML1() in IAMWebServiceDelegateImpl.java can crash the program by dereferencing a null pointer on line 906. In this paper we discuss some of the challenges of using a null It is equivalent to the following code: result = s Is Nothing OrElse s = String.Empty. Could someone advise here? Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. Does a barbarian benefit from the fast movement ability while wearing medium armor? vegan) just to try it, does this inconvenience the caterers and staff? If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Find centralized, trusted content and collaborate around the technologies you use most. chain: unchecked return value can lead to NULL dereference. 2005-11-07. Since the code does not check the return value from gethostbyaddr (CWE-252), a NULL pointer dereference (CWE-476) would then occur in the call to strcpy(). This type of 'return early' pattern is very common with validation as it avoids nested scopes thus making the code easier to read in general.
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