[PATCH][bpf] bpf: verifier: add break statement in switch

[PATCH][bpf] bpf: verifier: add break statement in switch

[Gustavo A. R. Silva]

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

Re: [PATCH][bpf] bpf: verifier: add break statement in switch

[Andrii Nakryiko]

On Wed, Jun 19, 2019 at 9:02 AM Gustavo A. R. Silva
<gustavo@embeddedor.com> wrote:
>
> 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>
> ---

Acked-by: Andrii Nakryiko <andriin@fb.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
>

Re: [PATCH][bpf] bpf: verifier: add break statement in switch

[Alexei Starovoitov]

On Wed, Jun 19, 2019 at 9:02 AM Gustavo A. R. Silva
<gustavo@embeddedor.com> wrote:
>
> 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>

this type of changes are not suitable for bpf tree.
Pls submit both as single patch to bpf-next