linux-kernel - [PATCH] media: media-device: use strlcpy() instead of strncpy()

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Date:   Mon, 8 Jan 2018 20:40:59 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <mchehab@...nel.org>
CC:     <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wangxiongfeng2@...wei.com>, <arnd@...db.de>
Subject: [PATCH] media: media-device: use strlcpy() instead of strncpy()

From: Xiongfeng Wang <xiongfeng.wang@...aro.org>

gcc-8 reports

drivers/media/media-device.c: In function 'media_device_get_topology':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' specified
bound 64 equals destination size [-Wstringop-truncation]

We need to use strlcpy() to make sure the dest string is nul-terminated.

Signed-off-by: Xiongfeng Wang <xiongfeng.wang@...aro.org>
---
 drivers/media/media-device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index e79f72b..f442444 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -255,7 +255,7 @@ static long media_device_get_topology(struct media_device *mdev,
 		memset(&kentity, 0, sizeof(kentity));
 		kentity.id = entity->graph_obj.id;
 		kentity.function = entity->function;
-		strncpy(kentity.name, entity->name,
+		strlcpy(kentity.name, entity->name,
 			sizeof(kentity.name));
 
 		if (copy_to_user(uentity, &kentity, sizeof(kentity)))
-- 
1.8.3.1