[LLVMbugs] [Bug 19725] New: False positive: garbage array value

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon May 12 09:27:14 PDT 2014


            Bug ID: 19725
           Summary: False positive: garbage array value
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: daniel.marjamaki at evidente.se
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Example code:

void f(const unsigned char n) {
    int              buf[2][4]  = {{0,0,0,0},{0,0,0,0}};
    unsigned char    j,k,l,x;

    for (l = n - 1; l >= 1; l--)
        x = 0;

    for (j = n - 1; j >= 1; j--) {
        for (k = 0; k <= j - 1; k++)
            x = buf[k][j];

I get this false positive:

clang-uninit-fp.c:12:15: warning: Assigned value is garbage or undefined
            x = buf[k][j];

But as far as I can tell, buf data is completely initialized.

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