From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Lawrence Brakmo <brakmo@fb.com>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
Kees Cook <keescook@chromium.org>
Subject: [PATCH][bpf] bpf: verifier: add break statement in switch
Date: Wed, 19 Jun 2019 11:02:07 -0500 [thread overview]
Message-ID: <20190619160207.GA26960@embeddedor> (raw)
Notice that in this case, it's much clearer to explicitly add a break
rather than letting the code to fall through. It also avoid potential
future fall-through warnings[1].
This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.
[1] https://lore.kernel.org/patchwork/patch/1087056/
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
kernel/bpf/verifier.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index d2c8a6677ac4..0acf7c569ec6 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5365,6 +5365,7 @@ static int check_return_code(struct bpf_verifier_env *env)
if (env->prog->expected_attach_type == BPF_CGROUP_UDP4_RECVMSG ||
env->prog->expected_attach_type == BPF_CGROUP_UDP6_RECVMSG)
range = tnum_range(1, 1);
+ break;
case BPF_PROG_TYPE_CGROUP_SKB:
case BPF_PROG_TYPE_CGROUP_SOCK:
case BPF_PROG_TYPE_SOCK_OPS:
--
2.21.0
next reply other threads:[~2019-06-19 16:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-19 16:02 Gustavo A. R. Silva [this message]
2019-06-19 17:43 ` [PATCH][bpf] bpf: verifier: add break statement in switch Andrii Nakryiko
2019-06-20 4:40 ` Alexei Starovoitov
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