mirror/libbpf
1
0 Fork 0
mirror of https://github.com/netdata/libbpf.git synced 2026-11-06 09:50:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

libbpf: Improve sanity checking during BTF fix up

Browse Source 
If BTF is corrupted DATASEC's variable type ID might be incorrect.
Prevent this easy to detect situation with extra NULL check.
Reported by oss-fuzz project.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20211103173213.1376990-3-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko authored and Andrii Nakryiko committed 2021-11-06 19:33:03 -07:00
1 parent 738277b773
commit 2f52e2afc0
1 file changed
+2 -3
Download Patch File Download Diff File Expand all files Collapse all files
src/libbpf.c
+2 -3
View File
@@ -2752,13 +2752,12 @@ static int btf_fixup_datasec(struct bpf_object *obj, struct btf *btf,
for (i = 0, vsi = btf_var_secinfos(t); i < vars; i++, vsi++) {
t_var = btf__type_by_id(btf, vsi->type);
var = btf_var(t_var);
if (!btf_is_var(t_var)) {
if (!t_var || !btf_is_var(t_var)) {
pr_debug("Non-VAR type seen in section %s\n", name);
return -EINVAL;
}
var = btf_var(t_var);
if (var->linkage == BTF_VAR_STATIC)
continue;