[Qemu-stable] [PATCH 066/156] virtio: allow mapping up to max queue size

[Michael Roth]

From: "Michael S. Tsirkin" <address@hidden>

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" <address@hidden>
Cc: address@hidden
Signed-off-by: Michael S. Tsirkin <address@hidden>
(cherry picked from commit 937251408051e0489f78e4db3c92e045b147b38b)
Signed-off-by: Michael Roth <address@hidden>
---
 hw/virtio/virtio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 151fae9..c6265c6 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -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);
-- 
1.9.1