[PATCH 1/2] vfio/fsl-mc: return -EFAULT if copy_to_user() fails

[Dan Carpenter]

The copy_to_user() function returns the number of bytes remaining to be
copied, but this code should return -EFAULT.

Fixes: df747bcd5b21 ("vfio/fsl-mc: Implement VFIO_DEVICE_GET_REGION_INFO ioctl 
call")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/vfio/fsl-mc/vfio_fsl_mc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c 
b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 0113a980f974..21f22e3da11f 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -248,7 +248,9 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned 
int cmd,
                info.size = vdev->regions[info.index].size;
                info.flags = vdev->regions[info.index].flags;
 
-               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:
        {
@@ -267,7 +269,9 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned 
int cmd,
                info.flags = VFIO_IRQ_INFO_EVENTFD;
                info.count = 1;
 
-               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:
        {
-- 
2.28.0