From: linke li lilinke99@qq.com
stable inclusion from stable-v4.19.314 commit 9e7538cb8131946817218f793ceb334c63cfcdb8 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IA7IEQ
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit c2deb2e971f5d9aca941ef13ee05566979e337a4 ]
sk->sk_rcvbuf in __sock_queue_rcv_skb() and __sk_receive_skb() can be changed by other threads. Mark this as benign using READ_ONCE().
This patch is aimed at reducing the number of benign races reported by KCSAN in order to focus future debugging effort on harmful races.
Signed-off-by: linke li lilinke99@qq.com Reviewed-by: Eric Dumazet edumazet@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zhengchao Shao shaozhengchao@huawei.com --- net/core/sock.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/sock.c b/net/core/sock.c index f462fa055b74..428644f92443 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -404,7 +404,7 @@ int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) unsigned long flags; struct sk_buff_head *list = &sk->sk_receive_queue;
- if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { + if (atomic_read(&sk->sk_rmem_alloc) >= READ_ONCE(sk->sk_rcvbuf)) { atomic_inc(&sk->sk_drops); trace_sock_rcvqueue_full(sk, skb); return -ENOMEM; @@ -456,7 +456,7 @@ int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
skb->dev = NULL;
- if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { + if (sk_rcvqueues_full(sk, READ_ONCE(sk->sk_rcvbuf))) { atomic_inc(&sk->sk_drops); goto discard_and_relse; }