bpf: fix bpf_perf_event_read() loop upper bound
authorWei-Chun Chao <weichunc@plumgrid.com>
Wed, 12 Aug 2015 14:57:12 +0000 (07:57 -0700)
committerDavid S. Miller <davem@davemloft.net>
Wed, 12 Aug 2015 23:42:50 +0000 (16:42 -0700)
Verifier rejects programs incorrectly.

Fixes: 35578d798400 ("bpf: Implement function bpf_perf_event_read()")
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
kernel/bpf/verifier.c

index 48e1c719256038563c691653387428613d580214..ed12e385fb75997f559e345989b178bc4c709e22 100644 (file)
@@ -853,7 +853,7 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id)
        if (!map)
                return 0;
 
-       for (i = 0; i <= ARRAY_SIZE(func_limit); i++) {
+       for (i = 0; i < ARRAY_SIZE(func_limit); i++) {
                bool_map = (map->map_type == func_limit[i].map_type);
                bool_func = (func_id == func_limit[i].func_id);
                /* only when map & func pair match it can continue.