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.) All content is copyright protected. This is indeed a false positive because, at time of writing, the sonarqube java analyzer (version 4.2.1 at time of writing) does not support cross procedural analysis and so it is not able to determine that indeed, for the condition to be true, the value of minRating has to be non null. Void pointers cannot be dereferenced as any other pointer. Batch split images vertically in half, sequentially numbering the output files, Recovering from a blunder I made while emailing a professor. In C/C++ speak, 'dereferencing' simply means getting the object that a pointer . Why is there a voltage on my HDMI and coaxial cables? 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]. which would allow us to systematically observe what you are having. We resolved it by adding our tools path in the white list, and repackaging it. What sort of strategies would a medieval military use against a fantasy giant? This sounds indeed like a bug in the flow when an exception is raised. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Sonar: Null pointers should not be dereferenced, Why should Java 8's Optional not be used in arguments, Sonar alert : "private" methods that don't access instance data should be "static", sonarLint complains "Null pointers should not be dereferenced (squid:S2259)" despite that possibility being handled, Java: (false?) context.RaiseException , (/) Asking for help, clarification, or responding to other answers. IDE extension that lets you fix coding issues before they exist! Are there tables of wastage rates for different fruit and veg? 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. At this point we define size as strlen(input_str) + 1. Unfortunately, its actual state also has some limitations, like the one you are hitting here. 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?) Consider the following scenario: you are asked to create a Java class MetaDisplay that contains a static void printTable(String r) method. How can I check before my flight that the cloud separation requirements in VFR flight rules are met? Do "superinfinite" sets exist? raiseException() return, Sonar I have a sonar alert on this call minRating.getRatgCaam(). What methods/tools can be used to determine the cause so that you stop the exception from causing the progra. What is pointed to should only be deleted if it was created with new. Find centralized, trusted content and collaborate around the technologies you use most. Hi Andreas, Thanks for the feedback. The article easily misleads the reader into believeing that ensuring pointer validity boils down to checking for pointer being not equal to NULL. You can compare a pointer with NULL to test for the special condition. Why does Mister Mxyzptlk need to have a weakness in the comics? The fact that you can't pass a null (no object) with a reference parameter can be a reason to use a pointer instead. We might set a pointer to null even if we are not freeing a object, simply to dissociate one object from another: tty_driver->tty = NULL; /* detach low level driver from the tty device */ can have the value zero on a call to that function. Making statements based on opinion; back them up with references or personal experience. C# static code analysis: Null pointers should not be dereferenced Products In-IDE IDE extension that lets you fix coding issues before they exist! As for copy vs pointer/reference - it depends. Here is our source code: Sign in to download full-size image ), NPD.CHECK.CALL.MIGHTNPD.CHECK.CALL.MUSTNPD.CHECK.MIGHTNPD.CHECK.MUSTNPD.CONST.CALLNPD.CONST.DEREFNPD.FUNC.CALL.MIGHTNPD.FUNC.CALL.MUSTNPD.FUNC.MIGHTNPD.FUNC.MUSTNPD.GEN.CALL.MIGHTNPD.GEN.CALL.MUSTNPD.GEN.MIGHTNPD.GEN.MUSTRNPD.CALLRNPD.DEREF, 45 D, 123 D, 128 D, 129 D, 130 D, 131 D, 652 S, Checks for use of null pointers (rule partially covered). 4. java Additionally, if input_str is a null pointer, the call to strlen() dereferences a null pointer, also resulting in undefined behavior. I added an assertion to that compliant code example. . 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. This compliant solution ensures that both input_str andthe pointer returned by malloc() are not null: This noncompliant code example is from a version of drivers/net/tun.c and affects Linux kernel 2.6.30 [Goodin 2009]: The sk pointer is initialized to tun->sk before checking if tun is a null pointer. - the incident has nothing to do with me; can I use this this way? Minimising the environmental effects of my dyson brain. Goal > Further, if kstrdup() returns NULL, we should return ERR_PTR(-ENOMEM) to > the caller site. ncdu: What's going on with this second size column? Optimizers are optimizing based on this latitude and have been for years. Thus we should check > this kstrdup() operation. False-positives are pointed out in other SO posts (1 & 2), where nulls are involved across functions and procedures. The SonarJava SE engine is however, by default, not configured to explore methods declared in other files (in your case, your utility class CheckUtils). Explain about call by reference with an . minimal code sample to reproduce (with analysis parameter, and potential instructions to compile). You're in a company-managed project. In C, dereferencing a null pointer is undefined behavior. Thanks for contributing an answer to Stack Overflow! And the compliant solution guarantees that the pointer will be valid if the code calls memcpy(). Asking for help, clarification, or responding to other answers. We seem to have a false positive for "Null pointers should not be dereferenced" - squid:S2259. Thanks, David! Description The program can potentially dereference a null pointer, thereby raising a NullPointerException. Avoid Returning null from Methods. Small typo nit: "such as if i t pointed to freed memory" meant to say "if it" instead (removing whitespace). Is the God of a monotheism necessarily omnipotent? The correct idiom is to only allocate storage if the pointer is currently NULL. That is only true if possibleNumbers contains no element.. BTW: none of these warnings are shown by . This compliant solution ensures that the pointer returned by png_malloc() is not null. 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. I am a student implementing stack with singly linked list using C, following a book called Fundamentals of Data Structures in C.. The null pointer check for writing or dereferencing should be a compiler flag or library setting. Null pointer should not be dereferenced . Now (sonarqube java analyzer version 4.3.0.7717) it's supported and works fine. Null pointer should not be dereferenced , NullPointerException is thrown when program attempts to use an object reference that has the null value. The null concept refers to the idea that a pointer can hold a special value that is not equal to another pointer. Sonar detects that res.getBody() can be null when you do the check res.getBody()==null. . This will normally lead to an unhandled error, resulting in a segmentation fault. ucsi->connector gets dereferenced by both ucsi_connector_change() and ucsi_resume(), both check for ucsi->connector being NULL in case ucsi_init() has not finished yet; or in case ucsi_init() has failed. How to use Slater Type Orbitals as a basis functions in matrix method correctly? Is it possible to create a concave light? It also uses the unsigned type size_t to pass the length parameter, ensuring that negative values are not passed to func(). Perhaps this could be done with a special constraint that will notify the SE engine that we learned from a Debug.Assert call. In the code, we check the not nullity with java.util.Objects.nonNull(). Do not use a null in a case where an object is required, https://gcc.gnu.org/gcc-4.9/porting_to.html, Prior to 2018-01-12: CERT: Unspecified Relationship, Pointer Casting and Pointer Type Changes [HFC], Dereferencing an out-of-domain pointer [nullref], Section 5.2.18, "Null-Pointer Dereference", Dereferencing null pointers that were not returned by a function. Best to cite C11 s7.24.2.1 here: The memcpy function copies n characters from the object pointed to by s2 into the object pointed to by s1. It could be non-null the first time but not the second time, sonar does not know this. - the incident has nothing to do with me; can I use this this way? Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? There is no legitimate reason to dereference a null pointer unless you on a rare system that maps page zero (or you intend your program to crash). How can I check before my flight that the cloud separation requirements in VFR flight rules are met? SonarQube - Null Pointer Dereference Issue java simonsirak (Simon Sirak) June 14, 2018, 1:18pm 1 Hi! If the pointer is not NULL, see if the assignment occurs only in a branch of a conditional statement.Investigate when that branch does not execute. In layman's terms, a null pointer is a pointer to an address in the memory space that does not have a meaningful value and cannot be referenced by the calling program, for whatever reason. You need to benchmark. So the first execution of ValidateNumber inside the foreach works fine and valid is set to true.The second execution throws the exception and exception is set in the catch-Block.. When c_str is dereferenced in memcpy(), the program exhibits undefined behavior. There are other problems with this code, as is noted in the rule. positive S2637 in SonarQube 6.7.1 LTS, SonarQube for MSBuild not reporting quality issues, getTextContent() through "Null pointers should not be dereferenced". By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Whoops, you're right. Is it possible to rotate a window 90 degrees if it has the same length and width? vegan) just to try it, does this inconvenience the caterers and staff? Recovering from a blunder I made while emailing a professor. I feel my situation is not as complicated. If you say [in] or [out] without a modifier, then the modifier defaults to the pointer_default for the enclosing class. Reports. Pointer members in structs are not checked. Not the answer you're looking for? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. . If you try to access any member variables or methods with that variable, you are trying to dereference it. The 2nd NCCE/CS pair seems redundant with the first NCCE/CS pair. Your code needs to do something about the possible NullPointerException when some exception is caught, because in this scenario the responseDto will be null. When B is null, The control reaches inside the main if block only when length of A is 1. Is there a single-word adjective for "having exceptionally strong moral principles"? Find centralized, trusted content and collaborate around the technologies you use most. Do not dereference null pointers Created by Jeffrey Gennari, last modified by Jill Britton on Jan 18, 2023 Dereferencing a null pointer is undefined behavior. 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. Making statements based on opinion; back them up with references or personal experience. Doing so will at best cause abrupt program termination, without the Which ensures that the chunkdata pointer is valid, but makes no such check to the user_data pointer. This code also violates ERR33-C. Detect and handle standard library errors. How do I align things in the following tabular environment? sonarqube 3.Null pointers should not be derefer enced/accessed. I think "res.getBody() == null" checks null first so it should go to return line, not reach to next if condition. It is still a pointer though, to use it you just have to cast it to another kind of pointer first. Coverity Prevent cannot discover all violations of this rule, so further verification is necessary, Detects when NULL is dereferenced (Array of pointers is not checked. 1 Null pointers should not be dereferenced @CheckForNull String getName(){.} {"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. C static code analysis: Null pointers should not be dereferenced C static code analysis Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your C code All rules 311 Vulnerability 13 Bug 74 Security Hotspot 18 Code Smell 206 Quick Fix 14 Tags "memset" should not be used to delete sensitive data Vulnerability At best, such an exception will cause abrupt program termination.
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