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commit7922460e33upstream. The copy_to/from_user() functions return the number of bytes which we weren't able to copy but the ioctl should return -EFAULT if they fail. Fixes:a127c5bbb6("vhost-vdpa: fix backend feature ioctls") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/20201023120853.GI282278@mwanda Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Cc: stable@vger.kernel.org Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>