On 8/6/24 3:51 AM, Ma Ke wrote:
To prevent potential error return values, it is necessary to check the return value of btf__type_by_id. We can add a kind checking to fix the issue.
Cc: stable@vger.kernel.org Fixes: 430025e5dca5 ("libbpf: Add subskeleton scaffolding") Signed-off-by: Ma Ke make24@iscas.ac.cn
tools/lib/bpf/libbpf.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index a3be6f8fac09..d1eb45d16054 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -13850,6 +13850,9 @@ int bpf_object__open_subskeleton(struct bpf_object_subskeleton *s) var = btf_var_secinfos(map_type); for (i = 0; i < len; i++, var++) { var_type = btf__type_by_id(btf, var->type);
if (!var_type)return libbpf_err(-ENOENT);
Could you give a detailed example when this error could be triggered?
var_name = btf__name_by_offset(btf, var_type->name_off); if (strcmp(var_name, var_skel->name) == 0) { *var_skel->addr = map->mmaped + var->offset;