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[Bug libc/14195] New: strncasecmp causes segmentation fault when comparing empty strings
- From: "kari.jyrkinen at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Mon, 04 Jun 2012 09:49:49 +0000
- Subject: [Bug libc/14195] New: strncasecmp causes segmentation fault when comparing empty strings
- Auto-submitted: auto-generated
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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