Re: [PATCH] vhost_vdpa: return -EFAULT if copy_to_user() fails

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On Wed, Dec 02, 2020 at 09:44:43AM +0300, Dan Carpenter wrote:
The copy_to_user() function returns the number of bytes remaining to be
copied but this should return -EFAULT to the user.

Fixes: 1b48dc03e575 ("vhost: vdpa: report iova range")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
drivers/vhost/vdpa.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>


diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index d6a37b66770b..ef688c8c0e0e 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -344,7 +344,9 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
		.last = v->range.last,
	};

-	return copy_to_user(argp, &range, sizeof(range));
+	if (copy_to_user(argp, &range, sizeof(range)))
+		return -EFAULT;
+	return 0;
}

static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
--
2.29.2

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