Replace offsetof(hdr_len) + sizeof(hdr_len) with offsetofend(hdr_len) to
simplify the check for correctness of btf_data_size in btf_parse_hdr()

Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
---
 kernel/bpf/btf.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 6d9e711cb5d4..97fd853db16b 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -4480,8 +4480,7 @@ static int btf_parse_hdr(struct btf_verifier_env *env)
 	btf = env->btf;
 	btf_data_size = btf->data_size;
 
-	if (btf_data_size <
-	    offsetof(struct btf_header, hdr_len) + sizeof(hdr->hdr_len)) {
+	if (btf_data_size < offsetofend(struct btf_header, hdr_len)) {
 		btf_verifier_log(env, "hdr_len not found");
 		return -EINVAL;
 	}
-- 
2.35.1

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Sun, 20 Mar 2022 15:52:40 +0800 you wrote:
> Replace offsetof(hdr_len) + sizeof(hdr_len) with offsetofend(hdr_len) to
> simplify the check for correctness of btf_data_size in btf_parse_hdr()
> 
> Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
> ---
>  kernel/bpf/btf.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

Here is the summary with links:
  - [bpf-next] bpf: Simplify check in btf_parse_hdr()
    https://git.kernel.org/bpf/bpf-next/c/583669ab3aed

You are awesome, thank you!
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