linux-hardening - [PATCH][next] bpf: verifier: Use fallthrough pseudo-keyword

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Message-ID: <20201002234217.GA12280@embeddedor>
Date:   Fri, 2 Oct 2020 18:42:17 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] bpf: verifier: Use fallthrough pseudo-keyword

Replace /* fallthrough */ comments with the new pseudo-keyword macro
fallthrough[1].

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 kernel/bpf/verifier.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 015a1c074b6b..fcef04b80b66 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2667,7 +2667,7 @@ static bool may_access_direct_pkt_data(struct bpf_verifier_env *env,
 	case BPF_PROG_TYPE_CGROUP_SKB:
 		if (t == BPF_WRITE)
 			return false;
-		/* fallthrough */
+		fallthrough;
 
 	/* Program types with direct read + write access go here! */
 	case BPF_PROG_TYPE_SCHED_CLS:
@@ -5432,7 +5432,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
 		/* smin_val represents the known value */
 		if (known && smin_val == 0 && opcode == BPF_ADD)
 			break;
-		/* fall-through */
+		fallthrough;
 	case PTR_TO_PACKET_END:
 	case PTR_TO_SOCKET:
 	case PTR_TO_SOCKET_OR_NULL:
-- 
2.27.0