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authorDan Carpenter <dan.carpenter@oracle.com>2017-01-07 09:27:49 +0300
committerAlex Williamson <alex.williamson@redhat.com>2017-01-11 12:06:35 -0700
commit6ed0993a0b859ce62edf2930ded683e452286d39 (patch)
treed887337ec8e4b492163467fc95ef5672d35160aa
parenta121103c922847ba5010819a3f250f1f7fc84ab8 (diff)
vfio-mdev: return -EFAULT if copy_to_user() fails
The copy_to_user() function returns the number of bytes which it wasn't able to copy but we want to return a negative error code. Fixes: 9d1a546c53b4 ("docs: Sample driver to demonstrate how to use Mediated device framework.") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
-rw-r--r--samples/vfio-mdev/mtty.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 1fc57a5093a7..975af5bbf28d 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -1180,7 +1180,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
memcpy(&mdev_state->dev_info, &info, sizeof(info));
- return copy_to_user((void __user *)arg, &info, minsz);
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ return -EFAULT;
+
+ return 0;
}
case VFIO_DEVICE_GET_REGION_INFO:
{
@@ -1201,7 +1204,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
if (ret)
return ret;
- return copy_to_user((void __user *)arg, &info, minsz);
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ return -EFAULT;
+
+ return 0;
}
case VFIO_DEVICE_GET_IRQ_INFO:
@@ -1224,7 +1230,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
if (info.count == -1)
return -EINVAL;
- return copy_to_user((void __user *)arg, &info, minsz);
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ return -EFAULT;
+
+ return 0;
}
case VFIO_DEVICE_SET_IRQS:
{