https://bugs.kde.org/show_bug.cgi?id=424656
Bug ID: 424656
Summary: Uninitialised value was created by a heap allocation
Product: valgrind
Version: unspecified
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: rstan...@rsiny.com
Target Milestone: ---
SUMMARY
Possible incorrect errors using the source below. Occurs with gcc-8, gcc-9,
gcc-10 on Debian Testing, "valgrind-3.16.1"
STEPS TO REPRODUCE
1. Source:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DIM 32
int main(void)
{
char *p = NULL;
p = malloc(DIM);
if(p == NULL)
{
printf("Allocation error.\n");
exit(1);
}
strcpy(p, "This is a test.");
for(int x = 0 ; x < DIM; ++x)
{
printf("%02x ", p[x]);
}
putchar('\n');
free(p);
return 0;
}
2. "gcc -std=c18 -Wall -Wextra -Wpedantic -g -I . -o ptest ptest.c"
3. "valgrind -s --track-origins=yes ./ptest"
OBSERVED RESULT
==11539== Use of uninitialised value of size 8
==11539== at 0x48B4E5A: _itoa_word (_itoa.c:180)
==11539== by 0x48CE753: __vfprintf_internal (vfprintf-internal.c:1687)
==11539== by 0x48BAD6A: printf (printf.c:33)
==11539== by 0x10920D: main (ptest.c:33)
==11539== Uninitialised value was created by a heap allocation
==11539== at 0x483877F: malloc (vg_replace_malloc.c:307)
==11539== by 0x10919E: main (ptest.c:21)
==11539==
...
EXPECTED RESULT
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
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