[PATCH][bpf-next] bpf: verifier: add a break statement in switch

[PATCH][bpf-next] bpf: verifier: add a 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 709ce4cef8ba..0b38cc917d21 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -6066,6 +6066,7 @@ static int check_return_code(struct bpf_verifier_env *env)
 			range = tnum_range(0, 3);
 			enforce_attach_type_range = tnum_range(2, 3);
 		}
+		break;
 	case BPF_PROG_TYPE_CGROUP_SOCK:
 	case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
 	case BPF_PROG_TYPE_SOCK_OPS:
-- 
2.21.0

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

[Andrii Nakryiko]

On Wed, Jun 19, 2019 at 9:07 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 709ce4cef8ba..0b38cc917d21 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -6066,6 +6066,7 @@ static int check_return_code(struct bpf_verifier_env *env)
>                         range = tnum_range(0, 3);
>                         enforce_attach_type_range = tnum_range(2, 3);
>                 }
> +               break;
>         case BPF_PROG_TYPE_CGROUP_SOCK:
>         case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
>         case BPF_PROG_TYPE_SOCK_OPS:
> --
> 2.21.0
>

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

[Gustavo A. R. Silva]

On 6/19/19 12:44 PM, Andrii Nakryiko wrote:
> On Wed, Jun 19, 2019 at 9:07 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>
> 

Thanks, Andrii.

--
Gustavo