From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 26 May 2008 07:42:42 +0000 (+1000)
Subject: virtio: fix virtio_net xmit of freed skb bug
X-Git-Tag: v2.6.26-rc5~1^2~16^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7eb2e25112bf920bb0a4d1cca445f3d96874c25f;p=pandora-kernel.git

virtio: fix virtio_net xmit of freed skb bug

If we fail to transmit a packet, we assume the queue is full and put
the skb into last_xmit_skb.  However, if more space frees up before we
xmit it, we loop, and the result can be transmitting the same skb twice.

Fix is simple: set skb to NULL if we've used it in some way, and check
before sending.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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