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Michael S. Tsirkin authored
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: default avatarChris Mason <chris.mason@oracle.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
Tested-by: default avatarChris Mason <chris.mason@oracle.com>
Cc: stable@kernel.org # .34.x
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
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