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

[Martin KaFai Lau]

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.fastab...@gmail.com>
Signed-off-by: Martin KaFai Lau <ka...@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 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