From 5c621744b4270976f2dba71c49d92883afaf1604 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 19 Apr 2017 14:15:32 -0300
Subject: [PATCH] [media] rainshadow-cec: use strlcat instead of strncat
Git-commit: 5c621744b4270976f2dba71c49d92883afaf1604
Patch-mainline: v4.13-rc1
References: bsc#1051510

gcc warns about an obviously incorrect use of strncat():

Drivers/media/usb/rainshadow-cec/rainshadow-cec.c: In function 'rain_cec_adap_transmit':
drivers/media/usb/rainshadow-cec/rainshadow-cec.c:299:4: error: specified bound 48 equals the size of the destination [-Werror=stringop-overflow=]

It seems that strlcat was intended here, and using that makes the
code correct.

Fixes: 0f314f6c2e77 ("[media] rainshadow-cec: new RainShadow Tech HDMI CEC driver")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/media/usb/rainshadow-cec/rainshadow-cec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/usb/rainshadow-cec/rainshadow-cec.c
+++ b/drivers/media/usb/rainshadow-cec/rainshadow-cec.c
@@ -297,7 +297,7 @@ static int rain_cec_adap_transmit(struct
 			 cec_msg_destination(msg), msg->msg[1]);
 		for (i = 2; i < msg->len; i++) {
 			snprintf(hex, sizeof(hex), "%02x", msg->msg[i]);
-			strncat(cmd, hex, sizeof(cmd));
+			strlcat(cmd, hex, sizeof(cmd));
 		}
 	}
 	mutex_lock(&rain->write_lock);