bpf: Resolve modifiers when walking structs

It is impossible to use skb_frag_t in the tracing program. Resolve typedefs when walking structs. Signed-off-by: Stanislav Fomichev <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Acked-by: Yonghong Song <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
niw · Jun 30, 2023 · 819d434 · 819d434
1 parent 17e8e5d
commit 819d434
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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);