From: Greg Kroah-Hartman <greg@kroah.com>
Date: Mon, 17 Nov 2014 23:15:34 +0000 (-0800)
Subject: greybus: uart: handle NULL size requests in request_operation()
X-Git-Tag: v4.9-rc1~119^2~378^2~21^2~1877
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ed7538e5a36ee7b369cb0ab0616394cb2f892a9f;p=karo-tx-linux.git

greybus: uart: handle NULL size requests in request_operation()

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
---

diff --git a/drivers/staging/greybus/uart-gb.c b/drivers/staging/greybus/uart-gb.c
index 533c3c20d095..a4f745afa885 100644
--- a/drivers/staging/greybus/uart-gb.c
+++ b/drivers/staging/greybus/uart-gb.c
@@ -177,7 +177,8 @@ static int request_operation(struct gb_connection *connection, int type,
 		ret = -EIO;
 	} else {
 		/* Good request, so copy to the caller's buffer */
-		memcpy(response, local_response, response_size);
+		if (response_size && response)
+			memcpy(response, local_response, response_size);
 	}
 out:
 	gb_operation_destroy(operation);