The copy_to_user() function returns the number of bytes remaining to
be copied but we want to return a negative error code here.
Fixes: 0dce165b1adf ("vfio/mlx5: Introduce vfio precopy ioctl implementation")
Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
---
drivers/vfio/pci/mlx5/main.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c
index befdb0de32a1..83137228352e 100644
--- a/drivers/vfio/pci/mlx5/main.c
+++ b/drivers/vfio/pci/mlx5/main.c
@@ -404,7 +404,10 @@ static long mlx5vf_precopy_ioctl(struct file *filp, unsigned int cmd,
done:
mlx5vf_state_mutex_unlock(mvdev);
- return copy_to_user((void __user *)arg, &info, minsz);
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ return -EFAULT;
+ return 0;
+
err_migf_unlock:
mutex_unlock(&migf->lock);
err_state_unlock:
--
2.35.1
