How a top-ranked engineering school reimagined CS curriculum (Ep. 0 is a valid value as far as memcpy() is concerned, and malloc() has special language concerning malloc(0). If the operand has type "type", the result has type "pointer to type". 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. 2005. rev2023.5.1.43405. And this error has been in the codebase for the last 9 Coverty scan correctly understood the logic of this code, and reported that the loop condition is wrong. What should I follow, if two altimeters show different altitudes? Although i'm only We haven't noticed an impact of the bug but the out of bounds access has been present since at least 2009 without anybody spotting it. It is always true that if E is a function designator or an lvalue that is a valid operand of the unary & operator, *&E is a function designator or an lvalue equal to E. If *P is an lvalue and T is the name of an object pointer type, *(T)P is an lvalue that has a type compatible with that to which T points. So let me be more precise in my wording: I assert that a platform whose memcpy() did anything besides copy zero bytes when given n=0 and valid src and dest pointers was not C-standards-compliant. extern char _etext; Ah, gotcha. In that case, if you want to change the value of the pointed-to data, well, have the pointer point to some writeable memory first! May it be expected that the address of operator will eventually be evaluated only after a pointer dereference for a desirable access to a data structure member? What's the rationale for null terminated strings? Did the drapes in old theatres actually say "ASBESTOS" on them? Find centralized, trusted content and collaborate around the technologies you use most. The code processes a physics modification option line given either from the command line or file. Coverity is correctly telling you that, albeit in a somewhat indirect way. I've changed it to say null pointer instead of invalid pointer. ssh component for Go allows clients to cause a denial of service (nil pointer dereference) against SSH servers. This pointer was the resaon of a memory leak Realy nice catch by Coverity.
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