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bpf: grab rcu read lock for bpf_percpu_hash_update

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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: 15a07b338 ("bpf: add lookup/update support for per-cpu hash and array maps")
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sasha Levin 2016-02-19 13:53:10 -05:00 committed by David S. Miller
parent dfa2eb8634
commit 6bbd9a05a1
1 changed files with 7 additions and 1 deletions
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8
kernel/bpf/hashtab.c
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@ -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 = {