https://bugs.kde.org/show_bug.cgi?id=483372
Bug ID: 483372
Summary: Double calloc() not detected
Classification: Developer tools
Product: valgrind
Version: 3.22.0
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: nsldvndvjdv154sf5v4...@proton.me
Target Milestone: ---
I was using Valgrind with one of my compiled code, and it was telling me that
an allocated block werent freed at the end of the program.
After a bit of research, i found that a symbol were used with `calloc()` 2
times in different functions in the program. I reproduced the same erroneous
situation in a simple way :
```
#include <stdio.h>
#include <stdlib.h>
int another_function(char **var) {
*var = calloc(10, sizeof(char));
if (!*var)
return -1;
return 0;
}
int main(void) {
char *var_one;
// ...
var_one = calloc(5, sizeof(char));
if (!var_one) {
printf("Allocation error on var_one\n");
return -1;
}
// ...
if (another_function(&var_one) == -1) {
printf("Allocation error on var_one from another_function\n");
free(var_one);
return -1;
}
free(var_one);
return 0;
}
```
Below is the Valgrind output, ran with `--leak-check=full` :
```
==12661== Memcheck, a memory error detector
==12661== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==12661== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==12661== Command: ./main
==12661==
==12661==
==12661== HEAP SUMMARY:
==12661== in use at exit: 5 bytes in 1 blocks
==12661== total heap usage: 2 allocs, 1 frees, 15 bytes allocated
==12661==
==12661== 5 bytes in 1 blocks are definitely lost in loss record 1 of 1
==12661== at 0x4849E60: calloc (vg_replace_malloc.c:1595)
==12661== by 0x40119B: main (in main)
==12661==
==12661== LEAK SUMMARY:
==12661== definitely lost: 5 bytes in 1 blocks
==12661== indirectly lost: 0 bytes in 0 blocks
==12661== possibly lost: 0 bytes in 0 blocks
==12661== still reachable: 0 bytes in 0 blocks
==12661== suppressed: 0 bytes in 0 blocks
==12661==
==12661== For lists of detected and suppressed errors, rerun with: -s
==12661== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
```
I'm surprised that Valgrind didn't consider it as an error, i just wanted to
know if this is a correct behaviour or not since i did not found any similar
situation in QnA or any platform.
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