False negative leak with asprintf

[Pieter D]

#include <stdio.h>
int main()
{
    char* test = NULL;
    test = malloc(5);

    return 0;
}

This gives with cppcheck --enable=all test.c --library=gnu.cfg
test.c:9:5: error: Memory leak: test [memleak]
return 0;
^
test.c:6:10: style: Variable 'test' is assigned a value that is never used. [unreadVariable]
test = malloc(5);
^

But once I do:

#include <stdio.h>
int main()
{
    char* test = NULL;
    test = malloc(5);

    (void) asprintf(&test, "%s_1", "test");
    return 0;
}

This gives no errors, while I was expecting 2 leaks here (the malloc and the asprintf allocation)

If I do:

#include <stdio.h>
int main()
{
    char* test = NULL;
    test = malloc(5);

    (void) asprintf(NULL, "%s_1", "test");
    return 0;
}

This gives following errors which are correct:
test.c:9:5: error: Memory leak: test [memleak]
return 0;
^
test.c:8:21: error: Null pointer dereference [nullPointer]
(void) asprintf(NULL, "%s_1", "test");
^
test.c:6:10: style: Variable 'test' is assigned a value that is never used. [unreadVariable]
test = malloc(5);
^

Why is

 <memory>
    <alloc init="true" arg="1">asprintf</alloc>
    <dealloc>free</dealloc>
  </memory>

from gnu.cfg not getting hit?

[CHR]

Thanks for reporting, ticket is here: https://trac.cppcheck.net/ticket/12186