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s390/cio: return -EFAULT if copy_to_user() fails again

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commit 51c44babdc 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: e01bcdd613 ("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.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wang Qing 2021-03-01 20:01:33 +08:00 committed by Greg Kroah-Hartman
parent fd61e772f0
commit 686874ca92
1 changed files with 2 additions and 2 deletions
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4
drivers/s390/cio/vfio_ccw_ops.c
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@ -539,7 +539,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
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(struct mdev_device *mdev,
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:
{