From: Daniel Schwierzeck Date: Fri, 19 Aug 2011 12:04:20 +0000 (+0000) Subject: atm: br2684: Fix oops due to skb->dev being NULL X-Git-Tag: v2.6.34.13~145 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0dc7814d12a5bdf6648edd635d5f52f50f0ca04b;p=karo-tx-linux.git atm: br2684: Fix oops due to skb->dev being NULL commit fbe5e29ec1886967255e76946aaf537b8cc9b81e upstream. This oops have been already fixed with commit 27141666b69f535a4d63d7bc6d9e84ee5032f82a atm: [br2684] Fix oops due to skb->dev being NULL It happens that if a packet arrives in a VC between the call to open it on the hardware and the call to change the backend to br2684, br2684_regvcc processes the packet and oopses dereferencing skb->dev because it is NULL before the call to br2684_push(). but have been introduced again with commit b6211ae7f2e56837c6a4849316396d1535606e90 atm: Use SKB queue and list helpers instead of doing it by-hand. Signed-off-by: Daniel Schwierzeck Signed-off-by: David S. Miller Signed-off-by: Paul Gortmaker --- diff --git a/net/atm/br2684.c b/net/atm/br2684.c index f3bae1476798..e9b567731fc4 100644 --- a/net/atm/br2684.c +++ b/net/atm/br2684.c @@ -522,12 +522,13 @@ static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) spin_unlock_irqrestore(&rq->lock, flags); skb_queue_walk_safe(&queue, skb, tmp) { - struct net_device *dev = skb->dev; + struct net_device *dev; + + br2684_push(atmvcc, skb); + dev = skb->dev; dev->stats.rx_bytes -= skb->len; dev->stats.rx_packets--; - - br2684_push(atmvcc, skb); } __module_get(THIS_MODULE); return 0;