From: Eric Farman <farman@linux.ibm.com>
Date: Mon, 1 Mar 2021 18:33:24 +0000 (+0100)
Subject: s390/cio: return -EFAULT if copy_to_user() fails
X-Git-Tag: v4.19.181~84
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=49f3cfae0cf708578b6d9f343d139618fcdaa9b9;p=thirdparty%2Fkernel%2Fstable.git

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

commit d9c48a948d29bcb22f4fe61a81b718ef6de561a0 upstream.

Fixes: 120e214e504f ("vfio: ccw: realize VFIO_DEVICE_G(S)ET_IRQ_INFO ioctls")
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index a7056c2322e01..6873ab5fe57a8 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -383,7 +383,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
 		if (info.count == -1)
 			return -EINVAL;
 
-		return copy_to_user((void __user *)arg, &info, minsz);
+		return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
 	}
 	case VFIO_DEVICE_SET_IRQS:
 	{