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Coverity Scan - Static Analysis Can this be fixed if I reassign the *var1 to NULL again ?? Coverity analysis defect 116994: Dereference after null check - MongoDB It looks like a logic bug, which can cause a memory leaking. Does &((struct name *)NULL -> b) cause undefined behaviour in C11? What should I follow, if two altimeters show different altitudes? Why is this error being shown and is there a way to correct it? This vulnerability is capable. If you want to change the value of your pointer, just do. this patch have merged in upstream master branch. A common memory-leak idiom, is reallocating storage and assigning its address to a pointer that already points to allocated storage. Hence the error. In your code example, the p1my_item will be evaluated before t he & operator, and so this rule is violated, although you are really trying to do pointer arithmetic rather than see what the pointer points to. Which language's style guidelines should be used when writing code that is supposed to be called from another language? of making the mruby interpreter crash, thus affecting the. "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". unity3d - C# Coverity giving "Dereference before null check (REVERSE What's the rationale for null terminated strings? Coverity is giving you a warning because you are in fact doing a NULL check: Here, a_ptr is evaluated in a boolean context. In particular, this paragraph enables & to cancel out * (eg &*x == x) and [] (eg &x[5] == x + 5), but not ->. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In the complaint version, I like to make source code checking a little quicker by putting parenthesizes around arguments to |= or &= as. ), 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.