Finally my method is returning a response with value of restTemplate. A NULL pointer can be dereferenced when signatures are being verified on PKCS7 signed or signedAndEnveloped data. > Further, if kstrdup() returns NULL, we should return ERR_PTR(-ENOMEM) to > the caller site. Interactions/interfaces with C can't use references. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? How do you ensure that a red herring doesn't violate Chekhov's gun? in above code, 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. This is a matter of style, and also following code walkthrough. PS: I also tried the code in android studio which uses Lint and got no warnings. Put a new ResponseEntity is wrong because I won't know what will be the answer for the status of http. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. Sonar is ok. Sonar can't determine that the helper method did the null validation. Passing ownership of something also requires pointers. How do I align things in the following tabular environment? Doing so will cause a NullReferenceException to be thrown. That's true. 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. What is a serialVersionUID and why should I use it? To create a custom null validation method declare an attribute with name ValidatedNotNullAttribute and mark the parameter that is Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? The method takes a relation name r as input, executes the query "select * from r," and prints the result out in tabular format with the attribute names displayed in the table's header; the attribute names are displayed in the table's header. 412-268-5800, 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 pointer. Making statements based on opinion; back them up with references or personal experience. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This topic was automatically closed 7 days after the last reply. Dereferencing a null pointer is undefined behavior. It also adds assertions to document that certain other pointers must not be null. Maybe one of these methods is already doing what your methods is doing, and could be considered as replacement. Pointer members in structs are not checked. How can this new ban on drag possibly be considered constitutional? minimal code sample to reproduce (with analysis parameter, and potential instructions to compile). This issues is displayed by SonarQube. 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. The article easily misleads the reader into believeing that ensuring pointer validity boils down to checking for pointer being not equal to NULL. Mutually exclusive execution using std::atomic? 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! it could allow an attacker to bypass security measures. SONAR, SONARSOURCE, SONARLINT, SONARQUBE and SONARCLOUD are trademarks of SonarSource S.A. All other trademarks and copyrights are the property of their respective owners. to 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. At this point we define size as strlen(input_str) + 1. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. All content is copyright protected. res.getBody() == null || res.getBody().getServiceResult() == null). That is only true if possibleNumbers contains no element.. BTW: none of these warnings are shown by . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In the meantime, Im locking this thread. [4] Even if the object is null in this case, it will not give an exception and will print ' null ' to the output stream. Privacy Policy, Detect issues in your GitHub, Azure DevOps Services, Bitbucket Cloud, GitLab repositories. Issues Components. A reference to null should never be dereferenced/accessed. Thanks for your relpy. SonarQube Version 6.7.2 (build 37468) The method isNR(minRating) is a helper method that validate among other things, if the object minRating is null. Now, you can find the list of whitelisted methods here. How to tell which packages are held back due to phased updates. The solution that I recommend is not work with null returns or variables on Java, try to avoid it. Not the answer you're looking for? These can be: Invoking a method from a null object. When c_str is dereferenced in memcpy(), the program exhibits undefined behavior. . What is generic pointer? 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 uninitialized reference-type class members. Isn't easier just to check valid range of length? This is indeed an obvious False Positive from the rule. Made code more compliant with other rules. However, memory allocation > functions such as kstrdup() may fail and returns NULL. You can use Optional instead. See "Clever Attack Exploits Fully-Patched Linux Kernel" [Goodin 2009] for an example of a code execution exploit that resulted from a null pointer dereference. I guess you could write a proposal to modify the C Standard, but our coding standard is meant to provide guidance for the existing language. The problem is that something like %*pbl which reads a bitmask, will save the pointer to the bitmask in the buffer. I am a student implementing stack with singly linked list using C, following a book called Fundamentals of Data Structures in C.. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. At So Bar might not be initialized but then the last line of your example should not be evaluated in this case. Some Interesting Facts: 1) void pointers cannot be dereferenced. 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. "After the incident", I started to be more careful not to trip over things. I think "res.getBody() == null" checks null first so it should go to return line, not reach to next if condition. Find centralized, trusted content and collaborate around the technologies you use most. )}"); Thus we should check > this kstrdup() operation. One could argue that all code examples would be redundant with the first pair. And if there is no pointer_default declaration, then the default default is ref. rev2023.3.3.43278. 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. I believe that dereferencing NULL should not crash the system, should not allow a write to a NULL pointer area, but should always set errno, If I am a hacker, could I trap a null failure that would force a memory dump. It does not point to any area of memory. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. NULL vs Uninitialized pointer - An uninitialized pointer stores an undefined value. On such a call, a function that locates a character finds no occurrence, a function that compares two character sequences returns zero, and a function that copies characters copies zero characters. Just a few words about the rule now. 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. Hello. The expected result here is solve the issue with sonarqube. But the problem also exists in the compliant version, so I'm not so sure that it's really compliant. So no checking of the length is necessary (besides preventing integer overflow, which the compliant solution does). 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. In the simplest case, this function just returns the result of calling kmalloc. So the SIZE_MAX check was unnecessary. 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 EXP34-C is a common consequence of ignoring function return values, but it is a distinct error, and can occur in other scenarios too. In multithreaded programs, null pointer dereferences can violate cache coherency policies and can cause resource leaks. Now (sonarqube java analyzer version 4.3.0.7717) it's supported and works fine. What does it mean that a reference must refer to an object, not a dereferenced null pointer? 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. What is the point of Thrower's Bandolier? 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. And fwstr > is dereferenced in the following codes. It's even called out explicitly in C17 7.24.1p2: Where an argument declared as size_t n specifies the length of the array for a function, n can have the value zero on a call to that function. How can I check before my flight that the cloud separation requirements in VFR flight rules are met? 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). null(java.lang.NullPointerException) . sonarqube If copying takes place between objects that overlap, the behavior is undefined. Consider the following scenario: you are asked to create a Java class MetaDisplay that contains a static void printTable(String r) method. Carnegie Mellon University When you have a variable of non-primitive type, it is a reference to an object. Doing so will cause a NullPointerException to be thrown. Status: Dormant. So Bar might not be initialized but then the last line of your example should not be evaluated in this case. validated for null in your method declaration with it: 2008-2023 SonarSource S.A., Switzerland. Minimising the environmental effects of my dyson brain. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Is it possible to rotate a window 90 degrees if it has the same length and width? Sonar is ok. () 0 is certainly within the 'domain of the function' (a phrase defined by mathematics but not by C11), as copying 0 bytes is well-understood (although silly). It's still illegal. 3.Null pointers should not be derefer enced/accessed. This cross-file approach analysis can be quite resource-consuming, and we are not ready to openly enable the feature. In this case, the difference is the assumption thatmalloc() always returns non-nullfor the second NCCE, whereas the first NCCE has themalloc() abstracted away. Powered by Discourse, best viewed with JavaScript enabled. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? This engine is validating execution paths and checking for non-null values or null-check along the way, exploring all the possibilities. {"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. 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 You need to benchmark. 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 . The 2nd NCCE/CS pair seems redundant with the first NCCE/CS pair. Does a summoned creature play immediately after being summoned by a ready action? Recovering from a blunder I made while emailing a professor. The same problem we will have with "Add at least one assertion to this test case." On many platforms, dereferencing a null pointer results inabnormal program termination, but this is not required by the standard. The fact that you can't pass a null (no object) with a reference parameter can be a reason to use a pointer instead. vegan) just to try it, does this inconvenience the caterers and staff? The issue of passing n=0 to memcpy() is distinct from null or invalid pointers. Instead use String.valueOf (object). SonarLint: A "NullPointerException" could be thrown; "getBody()" can return null. To learn more, see our tips on writing great answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. False-positives are pointed out in other SO posts (1 & 2), where nulls are involved across functions and procedures. Identify where the allocation occurs. Privacy Policy, Detect issues in your GitHub, Azure DevOps Services, Bitbucket Cloud, GitLab repositories. rev2023.3.3.43278. A reference to null should never be dereferenced/accessed. public boolean isNameEmpty() { return getName().length() == 0; // Noncompliant; the result of getName() could be null, but isn't null-checked } . sonarlint complains that What is a NullPointerException, and how do I fix it?,What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them? I don't need to do this validation again. 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. You do not have permission to delete messages in this group, Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. PS: I also tried the code in android studio which uses Lint and got no warnings. In the complaint version, I like to make source code checking a little quicker by putting parenthesizes around arguments to |= or &= as.
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