I doubt that "length" of zero is a valid parameter, and although there no copy, but we see memory allocation. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. This solution also ensures that theuser_data pointer is not null. In some situations, however, dereferencing a null pointer can lead to the execution of arbitrary code [Jack 2007,van Sprundel 2006]. It also adds assertions to document that certain other pointers must not be null. The chunkdata pointer is later used as a destination argument in a call to memcpy(), resulting in user-defined data overwriting memory starting at address 0. To learn more, see our tips on writing great answers. Which version of SonarJava plugin do you have? (from res.getBody().getServiceResult() ). public boolean isNameEmpty() { return getName().length() == 0; // Noncompliant; the result of getName() could be null, but isn't null-checked } . To be precise, once length is changed to a size_t and cannot take negative values, it cannot have an invalid value. Review and Fix Illegally Dereferenced Pointer Checks Dereferencing > this null pointer may cause the kernel go wrong. How to fix int cannot be dereferenced? Explained by Sharing Culture Is null check needed before calling instanceof? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The issue is: memcpy() and friends do not explicitly state that a null pointer is a valid pointer value, even if the number of bytes to copy is 0. IMHO, the rule title should be changed to something less general. The expected result here is solve the issue with sonarqube. I think that checking for user_data being NULL would be an improvement to the CS so long as there is an explicit mention that user_data being NULL is invalid even if length == 0. [JAVA] 3.9 - FP for S2259 Null pointers should not be dereferenced How to use java.net.URLConnection to fire and handle HTTP requests, Why should Java 8's Optional not be used in arguments, sonarLint complains "Null pointers should not be dereferenced (squid:S2259)" despite that possibility being handled. null(java.lang.NullPointerException) . How can we prove that the supernatural or paranormal doesn't exist? NullPointerException is a RuntimeException. OpenSSL Releases Security Update - NHS Digital parsing /proc/self/maps under linux) one might find out whether the pointer points into mapped memory, but this is still not a guarantee of validity because it is very coarse-grained see again the above example. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Sonar false-positive on rule: Null pointers should not be dereferenced, Null Pointer Dereference issue not detected when the pointer is returned by another function. [PATCH v2] vsprintf: Do not have bprintf dereference pointers SonarQube Version 6.7.2 (build 37468) Share Improve this answer Follow answered Oct 5, 2017 at 16:27 JCP version in use: 2.6. The null pointer check for writing or dereferencing should be a compiler flag or library setting. Trying to understand how to get this basic Fourier Series. Ticket opened : Thanks a lot for the minimalized reproducer ! Ah, gotcha. The SonarJava SE engine is however, by default, not configured to explore methods declared in other files (in your case, your utility class CheckUtils). Is there a proper earth ground point in this switch box? Possible fix: Assign a valid address to the pointer in all branches of the conditional statement.. Pointer can point to dynamically allocated memory. Not the answer you're looking for? Sonar detects that res.getBody() can be null when you do the check res.getBody()==null. // <------- 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. Basically, yes. Asking for help, clarification, or responding to other answers. return p == NULL || (char *)p < &_etext; sonarLint (3.2.) As for today, the SE engine is able to explore non-overridable methods (static, for instance), when declared in the same file being analyzed. Yeah, I suspect once it's possible to allocate 2+gigs contiguously in amainstream install of a modern OS, we'll see a frenzy of new vulnerabilities come out. Please explain: Without this, we wont be able to help you. Not the answer you're looking for? In order to fix this, just do the following: BodyType body=res.getBody (); if (body == null || body.getServiceResult () == null) { return; } You can then even reuse body after that. When a variable is declared as being a pointer to type void, it is known as a generic pointer. How to convert the address of a dereferenced pointer from C to C# When and how should I use a ThreadLocal variable? But passing 0 to memcpy() is not one of them. Just because something is a pointer does not mean you should call delete . 0 is a valid value as far as memcpy() is concerned, and malloc() has special language concerning malloc(0). Solution 1, it looks like, today's solution tomorrow's problem. Explain about call by reference with an . Is there a single-word adjective for "having exceptionally strong moral principles"? The 2nd NCCE/CS pair seems redundant with the first NCCE/CS pair. This sounds indeed like a bug in the flow when an exception is raised. At worst, it could expose debugging information that would be useful to an attacker, or it could allow an attacker to bypass security measures. That's true. What are the effects of exceptions on performance in Java? C# static code analysis: HTTP responses should not be vulnerable to Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Sonar is ok. In C, dereferencing a null pointer is undefined behavior. It's a modular system with the . A common memory-leak idiom, is reallocating storage and assigning its address to a pointer that already points to allocated storage. In Java, a special null value can be assigned to an object reference. 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. Consider the following scenario: you are asked to create a Java class MetaDisplay that contains a static void printTable(String r) method. how to handle Sonarlint java:S2259 (Null pointers should not be What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? It could be non-null the first time but not the second time, sonar does not know this. 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 . Thanks for the feedback. A value is checked here to see whether it is null, but this value can't be null because it was previously dereferenced and if it were null a null pointer exception would have occurred at the earlier dereference. Check whether a String is not Null and not Empty. Asking for help, clarification, or responding to other answers. Hi @Michael! Dereferencing a null pointer can lead to a denial of service. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. MSBuild SonarQube Runner Resharper Plugin receives skipping info errors File not in sonarqube, SonarQube jenkins plugin returns "Server returned HTTP response code: -1, message: 'null' for URL: https://api.github.com/user", SonarQube: Ignore issues in blocks not working with regex, sonarLint complains "Null pointers should not be dereferenced (squid:S2259)" despite that possibility being handled, Java: (false?) in above code, which version of SonarQube are you using? 11 Sep, 2006. Report False-positive / False-negative [LTS] The new SonarQube LTS is here: SONARQUBE 9.9 LTS, S2259: Null pointers should not be dereferenced, find the list of whitelisted methods here, Rule java:S2259: False-positive NullPointerException bug logged when variable is null-checked by an imported method, What is the issue you are observing, in details, What version of SonarSource products you are using, as well as the version of SonarJava. Key here (explains table format and definitions), EXP34-C = Union( CWE-690, list) where list =. Making statements based on opinion; back them up with references or personal experience. The approximation of the try catch flow is such that we consider an exception can be thrown just after the curly brace of the try. I think "res.getBody() == null" checks null first so it should go to return line, not reach to next if condition. Calls to extension methods are not reported because they can still operate on null values. {"serverDuration": 214, "requestCorrelationId": "084acdc104f21c51"}, EXP34-C. Do not dereference null pointers, Clever Attack Exploits Fully-Patched Linux Kernel, ERR33-C. Detect and handle standard library errors, one compliant and one non-compliant example, CERT Oracle Secure Coding Standard for Java, EXP01-J. 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. Null pointers should not be dereferenced (#42) Issues - GitLab Original Java Specification Request (JSR) - Java Community Process Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. And the compliant solution guarantees that the pointer will be valid if the code calls memcpy(). Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Here is our source code: Sign in to download full-size image Unfortunately the problem is much more complex, and generally unsolvable within standard C. Consider the following example: There's no way f can check whether x points into valid memory or not. (in the meantime, in case of any other false-positive suspicion, make sure to check those latest versions as bunch of improvements are regularly released). That is only true if possibleNumbers contains no element.. BTW: none of these warnings are shown by . One could argue that all code examples would be redundant with the first pair. (I think you cover that in a different rule.) Thanks for contributing an answer to Stack Overflow! Null pointers should not be dereferenced. That makes sense. Not the answer you're looking for? I already tried to put ResponseEntity
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