virtio: fix oops on OOM
authorMichael S. Tsirkin <mst@redhat.com>
Mon, 26 Jul 2010 07:25:30 +0000 (16:55 +0930)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 26 Jul 2010 15:05:31 +0000 (08:05 -0700)
commit1fe9b6fef11771461e69ecd1bc8935a1c7c90cb5
tree3ecc82deed99dc11c67d64bfea2737fc68d769d3
parent2e65a2075cc740b485ab203430bdf3459d5551b6
virtio: fix oops on OOM

virtio ring was changed to return an error code on OOM,
but one caller was missed and still checks for vq->vring.num.
The fix is just to check for <0 error code.

Long term it might make sense to change goto add_head to
just return an error on oom instead, but let's apply
a minimal fix for 2.6.35.

Reported-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Tested-by: Chris Mason <chris.mason@oracle.com>
Cc: stable@kernel.org # .34.x
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/virtio/virtio_ring.c