[PATCH v2] tee: qcomtee: add missing va_end in early return qcomtee_object_user_init()

qcomtee_object_user_init() is a variadic function and when the function
return because there's no dispatch callback in QCOMTEE_OBJECT_TYPE_CB
case, there's no va_end to cleanup "ap" object initialized by va_start
and that can cause undefined behavior. So make sure to use va_end before
returning the error code when there's no dispatch callback.

This is reported by Coverity Scan as "Missing varargs init or cleanup".

Fixes: d6e290837e50 ("tee: add Qualcomm TEE driver")
Signed-off-by: Robertus Diawan Chris <[email protected]>
Reviewed-by: Amirreza Zarrabi <[email protected]>
---
v1 -> v2:
- Use "break" statement instead of "goto" statement. There's va_end
  outside of switch-case, so we only need to go out from switch-case
  instead of using a label (suggested by Amirreza Zarrabi).
- Add "Reviewed-by" tag from Amirreza Zarrabi.

v1:
https://lore.kernel.org/all/[email protected]/

I don't have the device, so I am not sure how to test this change.
Thank you.

 drivers/tee/qcomtee/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/tee/qcomtee/core.c b/drivers/tee/qcomtee/core.c
index b1cb50e434f0..60fe3b5776e3 100644
--- a/drivers/tee/qcomtee/core.c
+++ b/drivers/tee/qcomtee/core.c
@@ -306,8 +306,10 @@ int qcomtee_object_user_init(struct qcomtee_object *object,
 		break;
 	case QCOMTEE_OBJECT_TYPE_CB:
 		object->ops = ops;
-		if (!object->ops->dispatch)
-			return -EINVAL;
+		if (!object->ops->dispatch) {
+			ret = -EINVAL;
+			break;
+		}
 
 		/* If failed, "no-name". */
 		object->name = kvasprintf_const(GFP_KERNEL, fmt, ap);

base-commit: 5200f5f493f79f14bbdc349e402a40dfb32f23c8
-- 
2.54.0