[PATCH bpf-next 1/2] bpf: Resolve modifiers when walking structs

[Stanislav Fomichev <sdf@xxxxxxxxxx>]

It is impossible to use skb_frag_t in the tracing program.
Resolve typedefs when walking structs.

Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxx>
---
 kernel/bpf/btf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 29fe21099298..3dd47451f097 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6135,6 +6135,8 @@ static int btf_struct_walk(struct bpf_verifier_log *log, const struct btf *btf,
 
 	*flag = 0;
 again:
+	if (btf_type_is_modifier(t))
+		t = btf_type_skip_modifiers(btf, t->type, NULL);
 	tname = __btf_name_by_offset(btf, t->name_off);
 	if (!btf_type_is_struct(t)) {
 		bpf_log(log, "Type '%s' is not a struct\n", tname);
-- 
2.41.0.162.gfafddb0af9-goog