From: Achill Gilgenast Date: Tue, 29 Jul 2025 09:45:53 +0000 (+0200) Subject: libbpf: Avoid possible use of uninitialized mod_len X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=13cb75730b7a8b2dc8fe32874e159b2c7b75efde;p=thirdparty%2Fkernel%2Flinux.git 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 Acked-by: Yonghong Song Acked-by: Eduard Zingerman Link: https://lore.kernel.org/r/20250729094611.2065713-1-fossdd@pwned.life Signed-off-by: Alexei Starovoitov --- diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index e067cb5776bda..fb4d92c5c3394 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -10096,7 +10096,7 @@ static int find_kernel_btf_id(struct bpf_object *obj, const char *attach_name, enum bpf_attach_type attach_type, 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; fn_name = strchr(attach_name, ':');