[LLVMbugs] [Bug 15166] New: False positive on dereference of null pointer warning

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Feb 5 10:00:11 PST 2013


            Bug ID: 15166
           Summary: False positive on dereference of null pointer warning
           Product: clang
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: michael.morrell at intel.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Using the static analyzer from the checker-270 build for MacOSX on the
C++ source:

void set_x(void *&);

int foo(void)
    int *x = 0;

    set_x((void *&)x);
    return *x;

results in:

warning: Dereference of null pointer (loaded from variable 'x')

This doesn't happen if the "void" is replaced by "int".

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