From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Wang Qing wangqing@vivo.com
commit 51c44babdc19aaf882e1213325a0ba291573308f upstream.
The copy_to_user() function returns the number of bytes remaining to be copied, but we want to return -EFAULT if the copy doesn't complete.
Fixes: e01bcdd61320 ("vfio: ccw: realize VFIO_DEVICE_GET_REGION_INFO ioctl") Signed-off-by: Wang Qing wangqing@vivo.com Signed-off-by: Heiko Carstens hca@linux.ibm.com Link: https://lore.kernel.org/r/1614600093-13992-1-git-send-email-wangqing@vivo.co... Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/cio/vfio_ccw_ops.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -539,7 +539,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struc if (ret) return ret;
- return copy_to_user((void __user *)arg, &info, minsz); + return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; } case VFIO_DEVICE_GET_REGION_INFO: { @@ -557,7 +557,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struc if (ret) return ret;
- return copy_to_user((void __user *)arg, &info, minsz); + return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; } case VFIO_DEVICE_GET_IRQ_INFO: {