Replacing broken pins/legs on a DIP IC package, Bulk update symbol size units from mm to map units in rule-based symbology, How do you get out of a corner when plotting yourself into a corner. ability to run any cleanup processes. Possible fix: Assign a valid address to the pointer in all branches of the conditional statement.. Pointer can point to dynamically allocated memory. Perhaps this could be done with a special constraint that will notify the SE engine that we learned from a Debug.Assert call. Unlike reference types, pointer types are not tracked by the default garbage . Whoops, you're right. Hello. Dereferencing > this null pointer may cause the kernel go wrong. Which version of SonarJava plugin do you have? res.getBody() == null || res.getBody().getServiceResult() == null). Phew, we're agreed here. {"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. Im very new to sonar, is there a way to add methods to the whitelist? sonarqube We really appreciate your help. 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. This sounds indeed like a bug in the flow when an exception is raised. Setup is effortless and analysis is automatic for most languages, Fast, accurate analysis; enterprise scalability. So the SIZE_MAX check was unnecessary. If copying takes place between objects that overlap, the behavior is undefined. Trying to understand how to get this basic Fourier Series. 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 My below code where I'm calling a stored procedure is giving a null pointer exception. A NULL pointer can be dereferenced when signatures are being verified on PKCS7 signed or signedAndEnveloped data. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Basically, yes. How do I align things in the following tabular environment? All content is copyright protected. Doing so will at best cause abrupt program termination, without the 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. This will normally lead to an unhandled error, resulting in a segmentation fault. java Thanks for the feedback. When exploring such methods, the engine then deduces behaviors regarding null-checking (among other things). That is why I explicitly check for this in my attempted solution. 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(). 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" "After the incident", I started to be more careful not to trip over things. ), 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. Much like dereferencing a dangling (or wild) pointer leads to undefined behavior, dereferencing a null pointer also leads to undefined behavior. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, how to handle Sonarlint java:S2259 (Null pointers should not be dereferenced), How Intuit democratizes AI development across teams through reusability. https://stackoverflow.com/questions/47534436/, https://stackoverflow.com/questions/47534436/, java - Jenkins groovy : Error: java. 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 It also reinforces the notion to the reader that any time you see arithmetic in an allocation expression, you need to think about corner-cases. C# static code analysis: Null pointers should not be dereferenced Products In-IDE IDE extension that lets you fix coding issues before they exist! Your code needs to do something about the possible NullPointerException when some exception is caught, because in this scenario the responseDto will be null. 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.. In multithreaded programs, null pointer dereferences can violate cache coherency policies and can cause resource leaks. Please explain: Without this, we wont be able to help you. Thank you for clarifying your assertion until I understood it properly. When a variable is declared as being a pointer to type void, it is known as a generic pointer. The libpng library implements its own wrapper to malloc() that returns a null pointer on error or on being passed a 0-byte-length argument. I added a comment to explain that SIZE_MAX is the limit of size_t. Connect and share knowledge within a single location that is structured and easy to search. I believe in this case, either expression would work. Does it just mean failing to correctly check if a value is null? . Is there a proper earth ground point in this switch box? Not the answer you're looking for? Then we hit memcpy with length 0. There are many ways to resolve this. 5.2 Part 2 Sometimes a helper function is de ned to perform the memory allocation. ROSE does not handle cases where an allocation is assigned to an lvalue that is not a variable (such as a struct member or C++ function call returning a reference), Finds instances where a pointer is checked against NULL and then later dereferenced, Identifies functions that can return a null pointer but are not checked, Identifies code that dereferences a pointer and then checks the pointer against NULL, Can find the instances where NULL is explicitly dereferenced or a pointer is checked againstNULL but then dereferenced anyway. Thered be huge value in jumping onto the latest version of the ecosystem (notably SonarQube), and benefit from all latest analyzers (e.g. Setup is effortless and analysis is automatic for most languages, Fast, accurate analysis; enterprise scalability. Made code more compliant with other rules. 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. Agreed. Privacy Policy, Detect issues in your GitHub, Azure DevOps Services, Bitbucket Cloud, GitLab repositories. 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. Java Specification Participation Agreement version in use: 2.0. What is generic pointer? All rights are expressly reserved. You can use Optional instead. That's true. I added an assertion to that compliant code example. Goal The alert is related to the sonar rule : Null pointers should not be dereferenced. Asking for help, clarification, or responding to other answers. You can compare a pointer with NULL to test for the special condition. Asking for help, clarification, or responding to other answers. A reference to null should never be dereferenced/accessed. The above check can't hurt, as I guess you could have a system with a 32-bit size_t that had a ton of memory and had some crazy banking/selector scheme with pointers. Using platform-specific means (e.g. 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. That interpretation of the standard is not supported universally. We cannot understand how there could be a null pointer exception at the reported line. 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 (from res.getBody().getServiceResult() ). util.regex.Matcher, java - Swing .getParent() . If you say [in] or [out] without a modifier, then the modifier defaults to the pointer_default for the enclosing class. Why are physically impossible and logically impossible concepts considered separate in terms of probability? 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. This code also violates ERR33-C. Detect and handle standard library errors. Such long getter chains can also be replaced with Optional + map + ifPresent lambda style. What is pointed to should only be deleted if it was created with new. That noncompliant code example (it's currently the 3rd) came from the Linux kernel, whose source is publicly available. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. In this case, the difference is the assumption thatmalloc() always returns non-nullfor the second NCCE, whereas the first NCCE has themalloc() abstracted away. The user_data pointer could be invalid in other ways, such as pointing to freed memory. positive S2637 in SonarQube 6.7.1 LTS, SonarQube for MSBuild not reporting quality issues, getTextContent() through "Null pointers should not be dereferenced". In C/C++ speak, 'dereferencing' simply means getting the object that a pointer . points to memory allocated to the process) and what exactly was allocated there after the public key was freed, this may cause a segmentation fault or even execute code, which could again cause a segmentation fault, but might potentially be under the attacker's control. If that variable hasn't had a reference assigned, it's a null reference, which (for internal/historical reasons) is referred to as a null pointer. And if there is no pointer_default declaration, then the default default is ref. The only potential null is the return value of list(). Dereferencing a null pointer is undefined behavior, typically abnormal program termination. Dereferencing a null pointer is undefined behavior. By explicitly teaching the C++ standard class behaviors we can make the Analyzer to find more bugs related to modern C++ code. null(java.lang.NullPointerException) . Please direct comments on this JSR to the Spec Lead (s) Team. SonarQube - Null Pointer Dereference Issue java simonsirak (Simon Sirak) June 14, 2018, 1:18pm 1 Hi! 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. My question is; is my solution incorrect? The return value from strchr() is often NULL, but the dev might know that a specific strchr() function call will not return NULL. , RemoteContext new ExceptionType() RemoteContext , SonarLintJava (), java - sonarLint "Null pointers should not be dereferenced (squid:S2259)"Stack Overflow Share Improve this answer Follow answered Oct 5, 2017 at 16:27 If you call connect() function, it better do the connection, but failing simply because some ptr is NULL is not good behaviour -- failures should . Doing so will cause a NullReferenceException to be thrown. 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. Is there a proper earth ground point in this switch box? While the engine is in practice already able to explore code from other files if needed (relying solely on bytecode), we restrain this approach to a limited set of well-known methods from standard libraries, for which we know that behaviors are correctly produced. name result . What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Sonar detects that res.getBody() can be null when you do the check res.getBody()==null. So no checking of the length is necessary (besides preventing integer overflow, which the compliant solution does). 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?) Also, the term 'pointer' is bad (but maybe it comes from the FindBugs tool): Java doesn't have pointers, it has references. I'd guess null pointers are not valid, even though they point to 0 bytes. Cause we need throw our own Runtime Exception, well-known methods wont help. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2023.3.3.43278. Correct; a null pointer is not a valid pointer for the C library functions. Just because something is a pointer does not mean you should call delete . 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. There is a missing check for the return value from . The SonarJava SE engine is however, by default, not configured to explore methods declared in other files (in your case, your utility class CheckUtils). SonarQube Version 6.7.2 (build 37468) 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 Trying to understand how to get this basic Fourier Series. Find centralized, trusted content and collaborate around the technologies you use most. Is it possible to create a concave light? The method isNR(minRating) is a helper method that validate among other things, if the object minRating is null. This is a matter of style, and also following code walkthrough. 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. At best, such an exception will cause abrupt program termination. 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. 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. Report False-positive / False-negative [LTS] The new SonarQube LTS is here: SONARQUBE 9.9 LTS, SonarQube - Null Pointer Dereference Issue. Which ensures that the chunkdata pointer is valid, but makes no such check to the user_data pointer. Using Kolmogorov complexity to measure difficulty of problems? Asking for help, clarification, or responding to other answers. If you write [ref], then a null pointer is not allowed, but if you write [unique], then a null pointer is permitted. Null pointer should not be dereferenced . This code also violates ERR33-C. Detect and handle standard library errors. How can we prove that the supernatural or paranormal doesn't exist? This rule applies to all null pointers, regardless of which function returned them. I'd guess WG14 has considered these questions, but I haven't until now :). Dereferencing a null pointer can lead to a denial of service.
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