[Bug libc/14195] New: strncasecmp causes segmentation fault when comparing empty strings

[kari.jyrkinen at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14195

             Bug #: 14195
           Summary: strncasecmp causes segmentation fault when comparing
                    empty strings
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: unassigned@sourceware.org
        ReportedBy: kari.jyrkinen@gmail.com
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


Minimal example:

#include <string.h>

int main(int argc, const char *argv[]) {
  char *p = "";
  return strncasecmp(p, "", 1);
}

It seems the return value is corrupted as the compiled program crashes only
when it is referenced. Crashes only on 32 bit and certain processors, might bet
when SSE3 and SSE4 are in use, as this problem appeared in the newest glibc and
there seems to be changes for it done:

* Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.

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