From: Gustavo A. R. Silva Date: Thu, 11 Jul 2019 16:22:33 +0000 (-0500) Subject: bpf: verifier: avoid fall-through warnings X-Git-Tag: v5.15~5883^2~7^2~21 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ed4ed4043a127c5ca9a35339bb614693be9037a3;p=platform%2Fkernel%2Flinux-starfive.git bpf: verifier: avoid fall-through warnings In preparation to enabling -Wimplicit-fallthrough, this patch silences the following warning: kernel/bpf/verifier.c: In function ‘check_return_code’: kernel/bpf/verifier.c:6106:6: warning: this statement may fall through [-Wimplicit-fallthrough=] if (env->prog->expected_attach_type == BPF_CGROUP_UDP4_RECVMSG || ^ kernel/bpf/verifier.c:6109:2: note: here case BPF_PROG_TYPE_CGROUP_SKB: ^~~~ Warning level 3 was used: -Wimplicit-fallthrough=3 Notice that is much clearer to explicitly add breaks in each case statement (that actually contains some code), rather than letting the code to fall through. This patch is part of the ongoing efforts to enable -Wimplicit-fallthrough. Signed-off-by: Gustavo A. R. Silva Acked-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann --- diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index def87e9..5900cbb 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -6103,11 +6103,13 @@ 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: if (env->prog->expected_attach_type == BPF_CGROUP_INET_EGRESS) { range = tnum_range(0, 3); enforce_attach_type_range = tnum_range(2, 3); } + break; case BPF_PROG_TYPE_CGROUP_SOCK: case BPF_PROG_TYPE_SOCK_OPS: case BPF_PROG_TYPE_CGROUP_DEVICE: