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(parent: 3850d29) | patch
virtio_mmio: Don't attempt to create empty virtqueues
authorBrian Foley <brian.foley@arm.com>
Mon, 24 Sep 2012 13:33:42 +0000 (14:33 +0100)
committerRusty Russell <rusty@rustcorp.com.au>
Fri, 28 Sep 2012 05:35:16 +0000 (15:05 +0930)
commitd78b519f6b945aef6202bbb5b56f928572e15165
treeb055dd93fb446914a908ebec0829ce89df9b53c0tree | snapshot
parent3850d29fc40f3494a3e9c3aac45b6afe53526449commit | diff
virtio_mmio: Don't attempt to create empty virtqueues

If a virtio device reports a QueueNumMax of 0, vring_new_virtqueue()
doesn't check this, and thanks to an unsigned (i < num - 1) loop
guard, scribbles over memory when initialising the free list.

Avoid by not trying to create zero-descriptor queues, as there's no
way to do any I/O with one.

Signed-off-by: Brian Foley <brian.foley@arm.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
drivers/virtio/virtio_mmio.c diff | blob | history
Domain: System / Uncategorized;