From: Yuntao Wang <ytcoode@gmail.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org, Yuntao Wang <ytcoode@gmail.com>
Subject: [PATCH bpf-next] bpf: Simplify check in btf_parse_hdr()
Date: Sun, 20 Mar 2022 15:52:40 +0800 [thread overview]
Message-ID: <20220320075240.1001728-1-ytcoode@gmail.com> (raw)
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
next reply other threads:[~2022-03-20 7:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-20 7:52 Yuntao Wang [this message]
2022-03-21 14:00 ` [PATCH bpf-next] bpf: Simplify check in btf_parse_hdr() patchwork-bot+netdevbpf
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