specifies the length of the array for a function. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. My question is; is my solution incorrect? In the case of the ARM and XScale architectures, the 0x0 address is mapped in memory and serves as the exception vector table; consequently, dereferencing 0x0 did not cause an abnormal program termination. HTTP request redirections should not be open to forging attacks Deserialization should not be vulnerable to injection attacks Endpoints should not be vulnerable to reflected cross-site scripting (XSS) attacks "CoSetProxyBlanket" and "CoInitializeSecurity" should not be used Database queries should not be vulnerable to injection attacks The solution that I recommend is not work with null returns or variables on Java, try to avoid it. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. void *pointerVariableName = NULL; Since they are very general in nature, they are also known as generic pointers. Is a PhD visitor considered as a visiting scholar? I would therefore assert that a platform whose memcpy() did anything besides a no-op when given n=0 and valid source/destination pointers was not C-standards-compliant. Software project. Is null check needed before calling instanceof? Thanks for your relpy. The Clang Static Analyzer already has a checker to find the null pointer dereference in code, however it is not sufficient for higher abstractions such as C++ smart pointers or optionals. We resolved it by adding our tools path in the white list, and repackaging it. This is indeed an obvious False Positive from the rule. Recovering from a blunder I made while emailing a professor. Solution 1, it looks like, today's solution tomorrow's problem. You're in a company-managed project. can have the value zero on a call to that function. I feel my situation is not as complicated. Thanks for contributing an answer to Stack Overflow! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Can I tell police to wait and call a lawyer when served with a search warrant? So no checking of the length is necessary (besides preventing integer overflow, which the compliant solution does). Perhaps this could be done with a special constraint that will notify the SE engine that we learned from a Debug.Assert call. Trying to understand how to get this basic Fourier Series. context.RaiseException , (/) S2259: Null pointers should not be dereferenced java tsubasa (Jiaoyang Ma) January 11, 2019, 6:57am 1 versions used (SonarQube, Scanner, language analyzer) SonarQube Version 6.7.2 (build 37468) SonarJava Version 5.9.2 (build 16552) minimal code sample to reproduce (with analysis parameter, and potential instructions to compile). Fixed by #1156 Contributor 94cb5f8 boris-unckel on Jul 28, 2021 9e62550 boris-unckel mentioned this issue on Jul 28, 2021 Closes #1155 - Null pointers should not be dereferenced #1156 Merged Hi Andreas, Thanks for the feedback. Pointer members in structs are not checked. CWE-476: NULL Pointer Dereference: 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. NULL vs Void Pointer - Null pointer is a value, while void pointer is a type. The purpose of a NULL pointer is not to cause a processor exception when it is dereferenced (although that is nice to have for debugging.) What are the effects of exceptions on performance in Java? What is null pointer exception in android. Aaron:I suspect we are talking past each other. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Because a null pointer does not point to a meaningful object, an attempt to dereference(i.e., access the data stored at that memory location) a null pointer usually (but not always) causes a run-time error or immediate program crash. Should trycatch go inside or outside a loop? rev2023.3.3.43278. This is a matter of style, and also following code walkthrough. context.RaiseException . However, memory allocation > functions such as kstrdup() may fail and returns NULL. Asking for help, clarification, or responding to other answers. The indicated severity is for this more severe case; on platforms where it is not possible to exploit a null pointer dereference to execute arbitrary code, the actual severity is low. Isn't easier just to check valid range of length? Making statements based on opinion; back them up with references or personal experience. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? IDE extension that lets you fix coding issues before they exist! I don't need to do this validation again. res.getBody() == null || res.getBody().getServiceResult() == null). That makes sense. Powered by Discourse, best viewed with JavaScript enabled. Thered be huge value in jumping onto the latest version of the ecosystem (notably SonarQube), and benefit from all latest analyzers (e.g. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, SonarQube null pointers should not be dereferenced on try/catch, How Intuit democratizes AI development across teams through reusability. Automated Detection Null pointer dereferences can happen in path-dependent ways. // <------- reported violation: NullPointerException might be thrown as 'bar' is nullable here, https://jira.sonarsource.com/browse/SONARJAVA-1490, https://groups.google.com/d/msgid/sonarqube/4752a999-246e-42c2-bbdc-8a44a5564ce9%40googlegroups.com. I could've fixed this by changing else to else if (B != null && B.length == 1), but doing so rewards me with warning "condition(B != null && B.length == 1) is always true". )}"); Believing that dereferencing NULL shouldn't crash the system doesn't make it true. Issues Components. Why does Mister Mxyzptlk need to have a weakness in the comics? It also adds assertions to document that certain other pointers must not be null. 5.2 Part 2 Sometimes a helper function is de ned to perform the memory allocation. It is still a pointer though, to use it you just have to cast it to another kind of pointer first. Additionally, if input_str is a null pointer, the call to strlen() dereferences a null pointer, also resulting in undefined behavior. There can be a null pointer type for each pointer type, such as a pointer to a character or a pointer to an integer, although this is . How to tell which packages are held back due to phased updates. This noncompliant code example is derived from a real-world example taken from a vulnerable version of the libpng library as deployed on a popular ARM-based cell phone [Jack 2007]. SonarQube null pointers should not be dereferenced on try/catch, Sonarcube :Null pointers should not be dereferenced, How do you get out of a corner when plotting yourself into a corner. See C17 7.1.4p1, which says, in part: Each of the following statements applies unless explicitly stated otherwise in the detailed descriptions that follow: If an argument to a function has an invalid value (such as a value outside the domain of the function, or a pointer outside the address space of the program, or a null pointer, or a pointerto non-modifiable storage when the corresponding parameter is not const-qualified) or a type (after default argument promotion) not expected by a function with a variable number of arguments, the behavior is undefined. This code also violates ERR33-C. Detect and handle standard library errors. The issue arises when dereferenced pointers are used. int changed to size_t and if size_t parameter's is zero, allocate one word. When I scan with sonar-lint in idea, it seams white list is useful, but when use sonar-scanner, always FP, org.springframework.util.CollectionUtils#isEmpty It could be non-null the first time but not the second time, sonar does not know this. I added an assertion to that compliant code example. I was fixing some issues gathered by SonarQube when I stumbled upon the following issue: SonarQube violation: Possible null pointer dereference in ___ due to return value of called method, This error was found in the following code: else if (foo.list().length > 0) { }, I attempted to resolve this by rewriting as: else if (null != foo.list() && foo.list().length > 0) { }, foo is an instance of the File class in Java, and is directly instantiated through new File(). Then the reading of the buffer via bstr_printf() will then look at the pointer to process the final output. Because null pointer dereferencing is UB, the if (!tun) check can be elided entirely by the optimizer (since the tun->sk implies that tun must be non-null). We have a false positive with the " Null pointers should not be dereferenced -squid:S2259" rule : We have a "NullPointerException" false positive for which we do not know how to solve it. You need to benchmark. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Removing the check "exception != null" raises S2259 "Null pointers should not be dereferenced" on "throw exception". Your assertion is not backed by the wording in the standard, nor by common implementer understanding. NullPointerException is a RuntimeException. Discover SonarLint SaaS Setup is effortless and analysis is automatic for most languages Discover SonarCloud Self-Hosted Fast, accurate analysis; enterprise scalability Discover SonarQube Secrets ABAP The standard will simply copy 0 byteswhich is essentially a no-op. This code also violates ERR33-C. Detect and handle standard library errors. NullPointerException is thrown when program attempts to use an object reference that has the null value. that we haven't considered here: I'd guess null pointers are not valid, even though they point to 0 bytes. This sounds indeed like a bug in the flow when an exception is raised. name result . The problem is that something like %*pbl which reads a bitmask, will save the pointer to the bitmask in the buffer. Write a semantic patch to nd cases where the result of calling kmalloc is dereferenced with no previous NULL pointer test. The null pointer check for writing or dereferencing should be a compiler flag or library setting. Find centralized, trusted content and collaborate around the technologies you use most. In particular, ROSE ensures that any pointer returned by malloc(), calloc(), or realloc() is first checked for NULL before being used (otherwise, it is free()-ed). Haiku is a free and open-source operating system for PC designed to be binary compatible with the BeOS operating system and embodying the basic ideas of BeOS. The same problem we will have with "Add at least one assertion to this test case." Issues Components. ", Eclipse - Sonar S2629 possible false positive with new String, SonarQube null pointers should not be dereferenced on try/catch, getTextContent() through "Null pointers should not be dereferenced". All rights are expressly reserved. ncdu: What's going on with this second size column? SonarLint: A "NullPointerException" could be thrown; "getBody()" can return null. Can I tell police to wait and call a lawyer when served with a search warrant? 0 is a valid value as far as memcpy() is concerned, and malloc() has special language concerning malloc(0). This is a feature that we are currently heavily working on to be able to switch off such kind of false positives. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. minimal code sample to reproduce (with analysis parameter, and potential instructions to compile). Even if the object is null in this case, it will not give an exception and will print ' null ' to the output stream. SIZE_MAX is the largest possible value that a size_t could take, so it is not possible to have anything larger than SIZE_MAX. I was fixing some issues gathered by SonarQube when I stumbled upon the following issue: "SonarQube violation: Possible null pointer dereference in ___ due to return value of called method" Find centralized, trusted content and collaborate around the technologies you use most. I'd guess null pointers are not valid, even though they point to 0 bytes. Using platform-specific means (e.g. Finally my method is returning a response with value of restTemplate. A reference to Nothing should never be dereferenced/accessed. The article easily misleads the reader into believeing that ensuring pointer validity boils down to checking for pointer being not equal to NULL. At worst, it could expose debugging information that would be useful to an attacker, or it could allow an attacker to . Setup is effortless and analysis is automatic for most languages, Fast, accurate analysis; enterprise scalability. This solution also ensures that theuser_data pointer is not null. Powered by Discourse, best viewed with JavaScript enabled. > Further, if kstrdup() returns NULL, we should return ERR_PTR(-ENOMEM) to > the caller site. But when length of A is 1, the control never reaches the else block. When B is null, The control reaches inside the main if block only when length of A is 1. How handle the initialization of "responseDto" without "null" because is throwing the issue on sonar. In some situations, however, dereferencing a null pointer can lead to the execution of arbitrary code [Jack 2007,van Sprundel 2006]. ), Does not guess that return values from malloc(), strchr(), etc., can be NULL (The return value from malloc() is NULL only if there is OOMo and the dev might not care to handle that. In multithreaded programs, null pointer dereferences can violate cache coherency policies and can cause resource leaks. There are other problems with this code, as is noted in the rule. util.regex.Matcher, java - Swing .getParent() . Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Why do academics stay as adjuncts for years rather than move around? A null pointer in this position causes the read system call to fail with -EINVAL ("Invalid argument"). Finally, there is the matter of the compliant solution. So, this code should address the Sonar problem: You can also eliminate the null check using Optional>, like: Even I don't recommend this, you can just check the null responseDto without any use of Optional: Thanks for contributing an answer to Stack Overflow! Description: This JSR will work to develop standard annotations (such as @NonNull) that can be applied to Java programs to assist tools that detect software defects. There is no guarantee that subsequent invocations are returning the same value, thats why issue is raised. IMHO, the rule title should be changed to something less general. Is there a proper earth ground point in this switch box? When length is zero, it is probably unusable condition for this function. Is there a solution to add special characters from software and how to do it, Acidity of alcohols and basicity of amines. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. My main problem is because I'm doing a restTemplate.exchange with try-catch and declaring a variable with null value before the clause try and then using it inside the try. Identify where the allocation occurs. What is a serialVersionUID and why should I use it? The 2nd NCCE/CS pair seems redundant with the first NCCE/CS pair. Unless explicitly stated otherwise in the description of a particular function in this subclause, pointer arguments on such a call shall still have valid values, as described in 7.1.4. Rule squid:S2259 is based on a Symbolic Execution (SE) engine. At String *x, y; X is a pointer to a string, Y is a string & = address of variable/ operator || referencing operator * = value of address || dereferencing operator Pointers = stores memory address as its variables NULL pointer = a constant with a value of zero defined || assigned to null Void pointer = a pointer that is not associated with any data types New operator = denotes a request for .
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