[PATCH 5.2 04/20] bpf: fix NULL deref in btf_type_is_resolve_source_only

Greg Kroah-Hartman
2019-08-02T09:58:28Z

From: Stanislav Fomichev <sdf@google.com>

commit e4f07120210a1794c1f1ae64d209a2fbc7bd2682 upstream.

Commit 1dc92851849c ("bpf: kernel side support for BTF Var and DataSec")
added invocations of btf_type_is_resolve_source_only before
btf_type_nosize_or_null which checks for the NULL pointer.
Swap the order of btf_type_nosize_or_null and
btf_type_is_resolve_source_only to make sure the do the NULL pointer
check first.

Fixes: 1dc92851849c ("bpf: kernel side support for BTF Var and DataSec")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
kernel/bpf/btf.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -1928,8 +1928,8 @@ static int btf_array_resolve(struct btf_
/* Check array->index_type */
index_type_id = array->index_type;
index_type = btf_type_by_id(btf, index_type_id);
- if (btf_type_is_resolve_source_only(index_type) ||
- btf_type_nosize_or_null(index_type)) {
+ if (btf_type_nosize_or_null(index_type) ||
+ btf_type_is_resolve_source_only(index_type)) {
btf_verifier_log_type(env, v->t, "Invalid index");
return -EINVAL;
}
@@ -1948,8 +1948,8 @@ static int btf_array_resolve(struct btf_
/* Check array->type */
elem_type_id = array->type;
elem_type = btf_type_by_id(btf, elem_type_id);
- if (btf_type_is_resolve_source_only(elem_type) ||
- btf_type_nosize_or_null(elem_type)) {
+ if (btf_type_nosize_or_null(elem_type) ||
+ btf_type_is_resolve_source_only(elem_type)) {
btf_verifier_log_type(env, v->t,
"Invalid elem");
return -EINVAL;
@@ -2170,8 +2170,8 @@ static int btf_struct_resolve(struct btf
const struct btf_type *member_type = btf_type_by_id(env->btf,
member_type_id);

- if (btf_type_is_resolve_source_only(member_type) ||
- btf_type_nosize_or_null(member_type)) {
+ if (btf_type_nosize_or_null(member_type) ||
+ btf_type_is_resolve_source_only(member_type)) {
btf_verifier_log_member(env, v->t, member,
"Invalid member");
return -EINVAL;