netdev - [PATCH net-next] bpf: Fix map-in-map checking in the verifier

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Message-ID: <20170818011443.562793-1-kafai@fb.com>
Date:   Thu, 17 Aug 2017 18:14:43 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        John Fastabend <john.fastabend@...il.com>
Subject: [PATCH net-next] bpf: Fix map-in-map checking in the verifier

In check_map_func_compatibility(), a 'break' has been accidentally
removed for the BPF_MAP_TYPE_ARRAY_OF_MAPS and BPF_MAP_TYPE_HASH_OF_MAPS
cases.  This patch adds it back.

Fixes: 174a79ff9515 ("bpf: sockmap with sk redirect support")
Cc: John Fastabend <john.fastabend@...il.com>
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
 kernel/bpf/verifier.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 40f669ddb571..4f6e7eb42ba0 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1523,6 +1523,7 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id)
 	case BPF_MAP_TYPE_HASH_OF_MAPS:
 		if (func_id != BPF_FUNC_map_lookup_elem)
 			goto error;
+		break;
 	case BPF_MAP_TYPE_SOCKMAP:
 		if (func_id != BPF_FUNC_sk_redirect_map &&
 		    func_id != BPF_FUNC_sock_map_update &&
-- 
2.9.5