[patch -next] bpf: off by one in check_map_func_compatibility()

[Dan Carpenter]

The loop iterates one space too far, so we might read beyond the end of
the func_limit[] array.

Fixes: 35578d798400 ('bpf: Implement function bpf_perf_event_read() that get 
the selected hardware PMU conuter')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 48e1c71..ed12e38 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -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.
--
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