From 6571b5492492e3510d442ff2fc2795115e1f8def Mon Sep 17 00:00:00 2001
From: Sean Young <sean@mess.org>
Date: Fri, 20 Jan 2017 10:10:11 -0200
Subject: [PATCH] UPSTREAM: [media] lirc: fix null dereference for tx-only
 devices

tx-only RC devices do not have a receive buffer.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
(cherry picked from commit 7cebf2ee8b7e39c06c93b593b0848a7baf9e73a8)
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
---
 drivers/media/rc/lirc_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
index 7f5d109d488b..18b4daed8065 100644
--- a/drivers/media/rc/lirc_dev.c
+++ b/drivers/media/rc/lirc_dev.c
@@ -472,7 +472,7 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file)
 		if (retval) {
 			module_put(cdev->owner);
 			ir->open--;
-		} else {
+		} else if (ir->buf) {
 			lirc_buffer_clear(ir->buf);
 		}
 		if (ir->task)