https://bugs.kde.org/show_bug.cgi?id=475652
Arsen Arsenović <ar...@aarsen.me> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ar...@aarsen.me
--- Comment #4 from Arsen Arsenović <ar...@aarsen.me> ---
Minimal reproducer:
#include <string.h>
#include <wchar.h>
#include <stdlib.h>
int
main ()
{
wchar_t *bar = calloc(121, sizeof (wchar_t));
wmemset (bar, 1, 120);
wchar_t *foo = calloc(256, sizeof (wchar_t));
wcsncpy (foo, bar, 255);
}
~$ gcc -O3 ~/test.c && valgrind ./a.out
==4093631== Memcheck, a memory error detector
==4093631== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==4093631== Using Valgrind-3.21.0 and LibVEX; rerun with -h for copyright info
==4093631== Command: ./a.out
==4093631==
==4093631== Invalid read of size 32
==4093631== at 0x49ECE2D: __wcsncpy_avx2 (strncpy-avx2.S:337)
==4093631== by 0x1090B3: main (in /home/arsen/a.out)
==4093631== Address 0x4a72240 is 16 bytes after a block of size 496 in arena
"client"
==4093631==
==4093631== Conditional jump or move depends on uninitialised value(s)
==4093631== at 0x49ECE51: __wcsncpy_avx2 (strncpy-avx2.S:348)
==4093631== by 0x1090B3: main (in /home/arsen/a.out)
==4093631==
==4093631==
==4093631== HEAP SUMMARY:
==4093631== in use at exit: 1,508 bytes in 2 blocks
==4093631== total heap usage: 2 allocs, 0 frees, 1,508 bytes allocated
==4093631==
==4093631== LEAK SUMMARY:
==4093631== definitely lost: 1,508 bytes in 2 blocks
==4093631== indirectly lost: 0 bytes in 0 blocks
==4093631== possibly lost: 0 bytes in 0 blocks
==4093631== still reachable: 0 bytes in 0 blocks
==4093631== suppressed: 0 bytes in 0 blocks
==4093631== Rerun with --leak-check=full to see details of leaked memory
==4093631==
==4093631== Use --track-origins=yes to see where uninitialised values come from
==4093631== For lists of detected and suppressed errors, rerun with: -s
==4093631== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
~$
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