[llvm-bugs] [Bug 25568] New: analyzer reports use after free with fprintf is printing a variable address

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25568

            Bug ID: 25568
           Summary: analyzer reports use after free with fprintf is
                    printing a variable address
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: cliffyapp at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When provided the line:

fprintf(stderr, "%p realloc%6d %s [moved from %p]\n",
                    ptr, (int)siz, str, original_ptr);

clang reports a use of freed memory printing original_ptr.  It is true the
memory pointed to by the address stored in original_ptr has been freed, but in
this case we aren't trying to access that memory but instead print the address
at which it was located.  This appears to be a false positive, albeit one which
needs to be aware of how fprintf is using original_ptr.

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