[LLVMbugs] [Bug 16730] New: Static analyzer incorrectly reports leaks when realloc fails

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16730

            Bug ID: 16730
           Summary: Static analyzer incorrectly reports leaks when realloc
                    fails
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: labath at google.com
                CC: klimek at google.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

$ cat leak.c
#include <stdlib.h>

void Realloc(void** memory) {
  *memory = malloc(47);
  char* new_memory = realloc(*memory, 47);
  if (new_memory != NULL) {
    *memory = new_memory;
  }
}

$ ~/llvm/build/bin/clang --analyze leak.c
leak.c:9:1: warning: Potential memory leak
}
^
1 warning generated.


The problem with the above warning is that even if the realloc fails, the first
allocated block of memory will still be addressable by *memory (which will be
available to the caller). Therefore, this should not be reported as leaked.

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