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vhost_vdpa: return -EFAULT if copy_to_user() fails

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

Fixes: 1b48dc03e5 ("vhost: vdpa: report iova range")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/X8c32z5EtDsMyyIL@mwanda
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
This commit is contained in:
Dan Carpenter 2020-12-02 09:44:43 +03:00 committed by Michael S. Tsirkin
parent 98701a2a86
commit 2c602741b5
1 changed files with 3 additions and 1 deletions
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4
drivers/vhost/vdpa.c
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@ -348,7 +348,9 @@ 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,