Peter Oberparleiter 75ab455cf6 libutil: Avoid realloc() with zero size ...

According to the valgrind man-page, "the behaviour of realloc() with a
size of zero is implementation defined in C17 and undefined in C23."

The current glibc implementation frees the specified buffer, returns
NULL and doesn't set errno. While this behavior is unlikely to change
in the near future, code relying on it may not be compatible with other
libc implementations. Also this realloc() use is flagged as an error in
valgrind runs, making valgrind output less usable.

Fix this by explicitly adding code to cover the realloc(buffer, 0) case
in util_realloc(). Also change libutil users of realloc() to use
util_realloc() instead.

Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2026-01-19 13:03:19 +01:00

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