Thanks, David! 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. As for copy vs pointer/reference - it depends. A reference to null should never be dereferenced/accessed. It does not point to any area of memory. 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]. The user_data pointer could be invalid in other ways, such as pointing to freed memory. , NPE : null-, . Phew, we're agreed here. NullPointerException is thrown when program attempts to use an object reference that has the null value. sonarlint, sonarLint (3.2.) 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. That interpretation of the standard is not supported universally. How do you ensure that a red herring doesn't violate Chekhov's gun? 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. 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?) The problem is, I hope this code's result to be <5,3> and <9,6> BUT the console only shows me <5,3> and <9,3>. This is indeed an obvious False Positive from the rule. The null concept refers to the idea that a pointer can hold a special value that is not equal to another pointer. rev2023.3.3.43278. Sonar detects that res.getBody() can be null when you do the check res.getBody()==null. Doing so will cause a NullReferenceException to be thrown. Thanks for contributing an answer to Stack Overflow! 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. In C++, does dereferencing a nullptr itself cause undefined behaviour Isn't easier just to check valid range of length?
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