Public bug reported:
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
main()
{
char *a = malloc(1);
a[0] = '\0';
printf("%lu\n", (unsigned long)strlen(a));
}
Compile with "gcc -O2" and run valgrind.
==5977== Invalid read of size 4
==5977== at 0x400494: main (x.c:9)
==5977== Address 0x51ce040 is 0 bytes inside a block of size 1 alloc'd
==5977== at 0x4C28F9F: malloc (vg_replace_malloc.c:236)
==5977== by 0x40048D: main (x.c:7)
** Affects: valgrind (Ubuntu)
Importance: Undecided
Status: New
** Affects: valgrind (ALT Linux)
Importance: Unknown
Status: Unknown
** Affects: valgrind (Fedora)
Importance: Unknown
Status: Unknown
** Tags: oneiric
** Bug watch added: Red Hat Bugzilla #678518
https://bugzilla.redhat.com/show_bug.cgi?id=678518
** Also affects: valgrind (Fedora) via
https://bugzilla.redhat.com/show_bug.cgi?id=678518
Importance: Unknown
Status: Unknown
** Bug watch added: KDE Bug Tracking System #264936
http://bugs.kde.org/show_bug.cgi?id=264936
** Also affects: valgrind (ALT Linux) via
http://bugs.kde.org/show_bug.cgi?id=264936
Importance: Unknown
Status: Unknown
** Tags added: oneiric
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https://bugs.launchpad.net/bugs/852760
Title:
valgrind false positives on gcc-generated string routines
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