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virtio: allow mapping up to max queue size 

It's a loop from i < num_sg  and the array is VIRTQUEUE_MAX_SIZE - so
it's OK if the value read is VIRTQUEUE_MAX_SIZE.

Not a big problem in practice as people don't use
such big queues, but it's inelegant.

Reported-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 9372514080)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2014-05-12 12:04:20 +03:00 committed by Michael Roth
parent 9fbc298a47
commit 84321ba2b6
1 changed files with 1 additions and 1 deletions
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2
hw/virtio/virtio.c
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@ -427,7 +427,7 @@ void virtqueue_map_sg(struct iovec *sg, hwaddr *addr,
unsigned int i;
hwaddr len;
if (num_sg >= VIRTQUEUE_MAX_SIZE) {
if (num_sg > VIRTQUEUE_MAX_SIZE) {
error_report("virtio: map attempt out of bounds: %zd > %d",
num_sg, VIRTQUEUE_MAX_SIZE);
exit(1);