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libbpf: Avoid possible use of uninitialized mod_len 

Though mod_len is only read when mod_name != NULL and both are initialized
together, gcc15 produces a warning with -Werror=maybe-uninitialized:

libbpf.c: In function 'find_kernel_btf_id.constprop':
libbpf.c:10100:33: error: 'mod_len' may be used uninitialized [-Werror=maybe-uninitialized]
10100 |                 if (mod_name && strncmp(mod->name, mod_name, mod_len) != 0)
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libbpf.c:10070:21: note: 'mod_len' was declared here
10070 |         int ret, i, mod_len;
      |                     ^~~~~~~

Silence the false positive.

Signed-off-by: Achill Gilgenast <fossdd@pwned.life>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250729094611.2065713-1-fossdd@pwned.life
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Achill Gilgenast 2025-07-29 11:45:53 +02:00 committed by Alexei Starovoitov
parent abad3d0bad
commit 13cb75730b
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/libbpf.c
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@ -10096,7 +10096,7 @@ static int find_kernel_btf_id(struct bpf_object *obj, const char *attach_name,
enum bpf_attach_type attach_type, enum bpf_attach_type attach_type,
int *btf_obj_fd, int *btf_type_id) int *btf_obj_fd, int *btf_type_id)
{ {
int ret, i, mod_len; int ret, i, mod_len = 0;
const char *fn_name, *mod_name = NULL; const char *fn_name, *mod_name = NULL;
fn_name = strchr(attach_name, ':'); fn_name = strchr(attach_name, ':');