From: Andrii Nakryiko <andrii@kernel.org>
To: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
martin.lau@kernel.org
Cc: andrii@kernel.org, kernel-team@meta.com,
Shung-Hsi Yu <shung-hsi.yu@suse.com>
Subject: [PATCH bpf] bpf: fix do_misc_fixups() for bpf_get_branch_snapshot()
Date: Wed, 23 Oct 2024 09:19:16 -0700 [thread overview]
Message-ID: <20241023161916.2896274-1-andrii@kernel.org> (raw)
We need `goto next_insn;` at the end of patching instead of `continue;`.
It currently works by accident by making verifier re-process patched
instructions.
Reported-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Fixes: 314a53623cd4 ("bpf: inline bpf_get_branch_snapshot() helper")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
kernel/bpf/verifier.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index f9e2f1cd4975..587a6c76e564 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -21210,7 +21210,7 @@ static int do_misc_fixups(struct bpf_verifier_env *env)
delta += cnt - 1;
env->prog = prog = new_prog;
insn = new_prog->insnsi + i + delta;
- continue;
+ goto next_insn;
}
/* Implement bpf_kptr_xchg inline */
--
2.43.5
next reply other threads:[~2024-10-23 16:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-23 16:19 Andrii Nakryiko [this message]
2024-10-23 17:11 ` [PATCH bpf] bpf: fix do_misc_fixups() for bpf_get_branch_snapshot() Yonghong Song
2024-10-24 4:56 ` Shung-Hsi Yu
2024-10-24 5:20 ` patchwork-bot+netdevbpf
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