[PATCH bpf-next v4 1/3] bpf, net: allow passing NULL prog to check_member.

[thinker.li@gmail.com]

From: Kui-Feng Lee <thinker.li@gmail.com>

To reuse the check_member function of the bpf_struct_ops structure for
checking if an operator is supported, we permit passing a NULL value for
the "prog" argument in check_member. The check_member function of the
bpf_struct_ops structure will be utilized for checking cfi_stubs in a
subsequent patch when registering a struct_ops type.

netdev@vger.kernel.org
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 net/bpf/bpf_dummy_struct_ops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bpf/bpf_dummy_struct_ops.c b/net/bpf/bpf_dummy_struct_ops.c
index 02de71719aed..5fe5461d3173 100644
--- a/net/bpf/bpf_dummy_struct_ops.c
+++ b/net/bpf/bpf_dummy_struct_ops.c
@@ -178,7 +178,7 @@ static int bpf_dummy_ops_check_member(const struct btf_type *t,
 	case offsetof(struct bpf_dummy_ops, test_sleepable):
 		break;
 	default:
-		if (prog->aux->sleepable)
+		if (prog && prog->aux->sleepable)
 			return -EINVAL;
 	}
 
-- 
2.34.1