From: Anthony Liguori <aliguori@us.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: Anthony Liguori <aliguori@us.ibm.com>,
Rusty Russell <rusty@rustcorp.com.au>,
virtualization@lists.linux-foundation.org
Subject: [PATCH] Fix used_idx wrap-around in virtio
Date: Wed, 7 Nov 2007 15:49:24 -0600 [thread overview]
Message-ID: <11944721642196-git-send-email-aliguori@us.ibm.com> (raw)
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>
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 0e4baca..0e1bf05 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);
reply other threads:[~2007-11-07 21:49 UTC|newest]
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