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Message-ID: <46C0B6FD.7020701@goop.org>
Date: Mon, 13 Aug 2007 12:54:37 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Jeff Garzik <jeff@...zik.org>
CC: NetDev <netdev@...r.kernel.org>, Keir Fraser <keir@...source.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] xen-netfront: Avoid deref'ing skbafter it is potentially
freed.
xennet_tx_bug_gc can free the skb before we use it, so make sure we don't.
Jeff, this is -rc material.
Signed-off-by: Keir Fraser <keir@...source.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
Cc: Jeff Garzik <jeff@...zik.org>
diff -r 8bfc43f6d1b0 drivers/net/xen-netfront.c
--- a/drivers/net/xen-netfront.c Tue Aug 07 14:26:30 2007 -0700
+++ b/drivers/net/xen-netfront.c Mon Aug 13 09:39:15 2007 -0700
@@ -566,15 +566,16 @@ static int xennet_start_xmit(struct sk_b
if (notify)
notify_remote_via_irq(np->netdev->irq);
+ np->stats.tx_bytes += skb->len;
+ np->stats.tx_packets++;
+
+ /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
xennet_tx_buf_gc(dev);
if (!netfront_tx_slot_available(np))
netif_stop_queue(dev);
spin_unlock_irq(&np->tx_lock);
-
- np->stats.tx_bytes += skb->len;
- np->stats.tx_packets++;
return 0;
-
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