linux-kernel - [PATCH] bpf: Get the program type by resolve_prog

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Date:   Mon, 13 Nov 2023 03:18:12 +0000
From:   Wenli Xie <xwlpt@....com>
To:     martin.lau@...ux.dev, ast@...nel.org, daniel@...earbox.net,
        song@...nel.org
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wenli Xie <wlxie7296@...il.com>
Subject: [PATCH] bpf: Get the program type by resolve_prog_type() directly

From: Wenli Xie <wlxie7296@...il.com>

The bpf program type can be get by resolve_prog_type() directly.

Signed-off-by: Wenli Xie <wlxie7296@...il.com>
---
 kernel/bpf/btf.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 15d71d2986d3..b8ac96906bc5 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6963,7 +6963,7 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
 {
 	struct bpf_verifier_log *log = &env->log;
 	struct bpf_prog *prog = env->prog;
-	enum bpf_prog_type prog_type = prog->type;
+	enum bpf_prog_type prog_type = resolve_prog_type(env->prog);
 	struct btf *btf = prog->aux->btf;
 	const struct btf_param *args;
 	const struct btf_type *t, *ref_t;
@@ -7001,8 +7001,6 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
 		bpf_log(log, "Verifier bug in function %s()\n", tname);
 		return -EFAULT;
 	}
-	if (prog_type == BPF_PROG_TYPE_EXT)
-		prog_type = prog->aux->dst_prog->type;
 
 	t = btf_type_by_id(btf, t->type);
 	if (!t || !btf_type_is_func_proto(t)) {
-- 
2.34.1