iommufd: Fix return value of iommufd_fault_fops_write()

copy_from_user() may return number of bytes failed to copy, we should
not pass over this number to user space to cheat that write() succeed.
Instead, -EFAULT should be returned.

Link: https://patch.msgid.link/r/20260330030755.12856-1-zhenzhong.duan@intel.com
Cc: stable@vger.kernel.org
Fixes: 07838f7 ("iommufd: Add iommufd fault object")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: duanzhenzhong

drivers/iommu/iommufd/eventq.c

@@ -187,9 +187,10 @@ static ssize_t iommufd_fault_fops_write(struct file *filep, const char __user *b
 
 	mutex_lock(&fault->mutex);
 	while (count > done) {
-		rc = copy_from_user(&response, buf + done, response_size);
-		if (rc)
+		if (copy_from_user(&response, buf + done, response_size)) {
+			rc = -EFAULT;
 			break;
+		}
 
 		static_assert((int)IOMMUFD_PAGE_RESP_SUCCESS ==
 			      (int)IOMMU_PAGE_RESP_SUCCESS);