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| author | Anthony Liguori <aliguori@us.ibm.com> | 2007-11-07 22:49:24 +0100 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-11-12 03:59:09 +0100 |
| commit | 1bc4953ed44454c7f53d0b609445d1534981ee75 (patch) | |
| tree | 05f67206d6978261ad2569d3a0030f0299331191 /drivers/virtio/virtio_ring.c | |
| parent | virtio: more fallout from scatterlist changes. (diff) | |
| download | linux-1bc4953ed44454c7f53d0b609445d1534981ee75.tar.xz linux-1bc4953ed44454c7f53d0b609445d1534981ee75.zip | |
virtio: Fix used_idx wrap-around
The more_used() function compares the vq->vring.used->idx with last_used_idx.
Since vq->vring.used->idx is a 16-bit integer, and last_used_idx is an
unsigned int, this results in unpredictable behavior when vq->vring.used->idx
wraps around.
This patch corrects this by changing last_used_idx to the correct type.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio/virtio_ring.c')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 0e4baca21b8f..0e1bf053d8cd 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -53,7 +53,7 @@ struct vring_virtqueue unsigned int num_added; /* Last used index we've seen. */ - unsigned int last_used_idx; + u16 last_used_idx; /* How to notify other side. FIXME: commonalize hcalls! */ void (*notify)(struct virtqueue *vq); |