diff mbox

l2tp: fix l2tp_recv_dequeue()

Message ID 4EB1C9D0.9000001@gmail.com
State Superseded, archived
Delegated to: David Miller
Headers show

Commit Message

Eric Dumazet Nov. 2, 2011, 10:53 p.m. UTC 
On 02/11/2011 23:35, Misha Labjuk wrote:

> Thanks!!  Panic disappeared.
> 
>


Thanks !

Here is the official submission then :)

[PATCH] l2tp: fix l2tp_recv_dequeue()

Misha Labjuk reported panics occurring in l2tp_recv_dequeue()

If we release reorder_q.lock, we must not keep a dangling pointer (tmp)
and restart the whole loop.

Reported-by: Misha Labjuk <spiked.yar@gmail.com>
Tested-by: Misha Labjuk <spiked.yar@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
 net/l2tp/l2tp_core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

 		if (time_after(jiffies, L2TP_SKB_CB(skb)->expires)) {
@@ -433,7 +434,7 @@ static void l2tp_recv_dequeue(struct l2tp_session
*session)
 		 */
 		spin_unlock_bh(&session->reorder_q.lock);
 		l2tp_recv_dequeue_skb(session, skb);
-		spin_lock_bh(&session->reorder_q.lock);
+		goto start;
 	}

 out:

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Comments

Eric Dumazet Nov. 3, 2011, 6:50 a.m. UTC | #1 
On 02/11/2011 23:53, Eric Dumazet wrote:


> diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
> index 34b2dde..bf8d50c 100644
> --- a/net/l2tp/l2tp_core.c
> +++ b/net/l2tp/l2tp_core.c
> @@ -397,6 +397,7 @@ static void l2tp_recv_dequeue(struct l2tp_session
> *session)
>  	 * expect to send up next, dequeue it and any other


Oh well, thunderbird mangled this patch, I'll repost it when I get back
my laptop (evolution instead of thundercrap) in ~one hour, if its still
on my desk at office :(

Sorry David.
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diff mbox

Patch

diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 34b2dde..bf8d50c 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -397,6 +397,7 @@  static void l2tp_recv_dequeue(struct l2tp_session
*session)
 	 * expect to send up next, dequeue it and any other
 	 * in-sequence packets behind it.
 	 */
+start:
 	spin_lock_bh(&session->reorder_q.lock);
 	skb_queue_walk_safe(&session->reorder_q, skb, tmp) {