From: Greg Kroah-Hartman <gre...@linuxfoundation.org>
From: Wang Qing <wangq...@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 <wangq...@vivo.com>
Signed-off-by: Heiko Carstens <h...@linux.ibm.com>
Link:
https://lore.kernel.org/r/1614600093-13992-1-git-send-email-wangq...@vivo.com
Signed-off-by: Heiko Carstens <h...@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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
@@ -341,7 +341,7 @@ 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:
{
@@ -362,7 +362,7 @@ 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:
{
