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Commit 6bbd9a05 authored by Sasha Levin's avatar Sasha Levin Committed by David S. Miller
Browse files

bpf: grab rcu read lock for bpf_percpu_hash_update 



bpf_percpu_hash_update() expects rcu lock to be held and warns if it's not,
which pointed out a missing rcu read lock.

Fixes: 15a07b33 ("bpf: add lookup/update support for per-cpu hash and array maps")
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dfa2eb86

kernel/bpf/hashtab.c

+7 −1
Original line number Diff line number Diff line
@@ -619,7 +619,13 @@ int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value) 
int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,

			   u64 map_flags)

{

	return __htab_percpu_map_update_elem(map, key, value, map_flags, true);

	int ret;



	rcu_read_lock();

	ret = __htab_percpu_map_update_elem(map, key, value, map_flags, true);

	rcu_read_unlock();



	return ret;

}



static const struct bpf_map_ops htab_percpu_ops = {