4.15-stable review patch. If anyone has any objections, please let me know.
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From: Eric Auger eric.auger@redhat.com
[ Upstream commit 7ced6c98c7ab7a1f6743931e28671b833af79b1e ]
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: f88949138058 ("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 --- drivers/vhost/vhost.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -756,7 +756,7 @@ static int vhost_copy_to_user(struct vho struct iov_iter t; void __user *uaddr = vhost_vq_meta_fetch(vq, (u64)(uintptr_t)to, size, - VHOST_ADDR_DESC); + VHOST_ADDR_USED);
if (uaddr) return __copy_to_user(uaddr, from, size);