From 6bbd9a05a1f9839873a9290b5b7c6fafde8447ba Mon Sep 17 00:00:00 2001
From: Sasha Levin <sasha.levin@oracle.com>
Date: Fri, 19 Feb 2016 13:53:10 -0500
Subject: [PATCH] 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: 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>
---
kernel/bpf/hashtab.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index fd5db8fe9360d..a68e95133fcdb 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -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 = {
--
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