3.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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)
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html