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net: use rcu_dereference_protected to fetch sk_dst_cache in sk_destruct 

As Eric noticed, in .sk_destruct, sk->sk_dst_cache update is prevented, and
no barrier is needed for this. So change to use rcu_dereference_protected()
instead of rcu_dereference_check() to fetch sk_dst_cache in there.

v1->v2:
  - no change, repost after net-next is open.

Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2019-03-31 17:03:02 +08:00 committed by David S. Miller
parent b6163f194c
commit 5869b8fada
2 changed files with 2 additions and 2 deletions
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2
net/decnet/af_decnet.c
View File

@ -444,7 +444,7 @@ static void dn_destruct(struct sock *sk)
skb_queue_purge(&scp->other_xmit_queue);
skb_queue_purge(&scp->other_receive_queue);
dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
}
static unsigned long dn_memory_pressure;

2
net/ipv4/af_inet.c
View File

@ -160,7 +160,7 @@ void inet_sock_destruct(struct sock *sk)
WARN_ON(sk->sk_forward_alloc);
kfree(rcu_dereference_protected(inet->inet_opt, 1));
dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
dst_release(sk->sk_rx_dst);
sk_refcnt_debug_dec(sk);
}