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 533c3c2..a4f745a 100644 (file)
--- 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);