[PATCH] staging: vchiq_arm: Using copy_from_user() to copy data from userspace address

[Nguyen Dinh Phi]

This commit to fix the following sparse warning:
incorrect type in assignment (different address spaces)
expected void *[assigned] userdata
got void [noderef] __user *userdata

Signed-off-by: Nguyen Dinh Phi <phind.uet at gmail.com>
---
 .../staging/vc04_services/interface/vchiq_arm/vchiq_arm.c    | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index afbf01b7364c..2a4fc599f977 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -960,7 +960,10 @@ static int vchiq_irq_queue_bulk_tx_rx(struct vchiq_instance *instance,
 			current->pid);
 		userdata = &waiter->bulk_waiter;
 	} else {
-		userdata = args->userdata;
+		if (copy_from_user(userdata, args->userdata, sizeof(args->userdata))) {
+			ret = -EFAULT;
+			goto out;
+		}
 	}
 
 	status = vchiq_bulk_transfer(args->handle, NULL, args->data, args->size,
-- 
2.25.1