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net: dev_pick_tx() fix 

When dev_pick_tx() caches tx queue_index on a socket, we must check
socket dst_entry matches skb one, or risk a crash later, as reported by
Denys Fedorysychenko, if old packets are in flight during a route
change, involving devices with different number of queues.

Bug introduced by commit a4ee3ce3
(net: Use sk_tx_queue_mapping for connected sockets)

Reported-by: Denys Fedorysychenko <nuclearcat@nuclearcat.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-04-11 21:18:17 +00:00 committed by David S. Miller
parent 4eaa0e3c86
commit 8728c544a9
1 changed files with 6 additions and 2 deletions
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8
net/core/dev.c
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@ -1989,8 +1989,12 @@ static struct netdev_queue *dev_pick_tx(struct net_device *dev,
if (dev->real_num_tx_queues > 1) if (dev->real_num_tx_queues > 1)
queue_index = skb_tx_hash(dev, skb); queue_index = skb_tx_hash(dev, skb);
if (sk && sk->sk_dst_cache) if (sk) {
sk_tx_queue_set(sk, queue_index); struct dst_entry *dst = rcu_dereference(sk->sk_dst_cache);
if (dst && skb_dst(skb) == dst)
sk_tx_queue_set(sk, queue_index);
}
} }
} }