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vhost: Fix vhost_copy_to_user()

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[ Upstream commit 7ced6c98c7 ]

vhost_copy_to_user is used to copy vring used elements to userspace.
We should use VHOST_ADDR_USED instead of VHOST_ADDR_DESC.

Fixes: f889491380 ("vhost: introduce O(1) vq metadata cache")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Auger
2018-04-11 15:30:38 +02:00
committed by Greg Kroah-Hartman
parent 0c2d18968e
commit 73f1e78eb1
1 changed files with 1 additions and 1 deletions
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drivers/vhost/vhost.c
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@@ -744,7 +744,7 @@ static int vhost_copy_to_user(struct vhost_virtqueue *vq, void __user *to,
struct iov_iter t; struct iov_iter t;
void __user *uaddr = vhost_vq_meta_fetch(vq, void __user *uaddr = vhost_vq_meta_fetch(vq,
(u64)(uintptr_t)to, size, (u64)(uintptr_t)to, size,
VHOST_ADDR_DESC); VHOST_ADDR_USED);
if (uaddr) if (uaddr)
return __copy_to_user(uaddr, from, size); return __copy_to_user(uaddr, from, size);