[PATCH 3.19 016/177] sock: sock_dequeue_err_skb() needs hard irq safety

Greg Kroah-Hartman
2015-03-16T14:11:08Z

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit 997d5c3f4427f38562cbe207ce05bb25fdcb993b ]

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: 364a9e93243d1 ("sock: deduplicate errqueue dequeue")
Fixes: cb820f8e4b7f7 ("net: Provide a generic socket error queue delivery method for Tx time stamps.")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/core/skbuff.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3623,13 +3623,14 @@ struct sk_buff *sock_dequeue_err_skb(str
{
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)