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vfio/mlx5: fix error code in mlx5vf_precopy_ioctl()

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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: 0dce165b1a ("vfio/mlx5: Introduce vfio precopy ioctl implementation")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/Y5IKVknlf5Z5NPtU@kili
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Dan Carpenter 2022-12-08 19:01:26 +03:00 • committed by Alex Williamson
parent d1f0f50fbb
commit fe3dd71db2
1 changed files with 4 additions and 1 deletions
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5
drivers/vfio/pci/mlx5/main.c
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@ -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: