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sock: sock_dequeue_err_skb() needs hard irq safety

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Non NAPI drivers can call skb_tstamp_tx() and then sock_queue_err_skb()
from hard IRQ context.

Therefore, sock_dequeue_err_skb() needs to block hard irq or
corruptions or hangs can happen.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 364a9e9324 ("sock: deduplicate errqueue dequeue")
Fixes: cb820f8e4b ("net: Provide a generic socket error queue delivery method for Tx time stamps.")
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-02-18 05:47:55 -08:00 committed by David S. Miller
parent 846cd66788
commit 997d5c3f44
1 changed files with 3 additions and 2 deletions
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5
net/core/skbuff.c
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@ -3621,13 +3621,14 @@ struct sk_buff *sock_dequeue_err_skb(struct sock *sk)
{
struct sk_buff_head *q = &sk->sk_error_queue;
struct sk_buff *skb, *skb_next;
unsigned long flags;
int err = 0;
spin_lock_bh(&q->lock);
spin_lock_irqsave(&q->lock, flags);
skb = __skb_dequeue(q);
if (skb && (skb_next = skb_peek(q)))
err = SKB_EXT_ERR(skb_next)->ee.ee_errno;
spin_unlock_bh(&q->lock);
spin_unlock_irqrestore(&q->lock, flags);
sk->sk_err = err;
if (err)