linux-kernel - Re: [PATCH] HID: uhid: use strlcpy() instead of strncpy()

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Date:   Fri, 16 Feb 2018 13:37:15 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Xiongfeng Wang <wangxiongfeng2@...wei.com>
cc:     benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: uhid: use strlcpy() instead of strncpy()

On Tue, 9 Jan 2018, Xiongfeng Wang wrote:

> From: Xiongfeng Wang <xiongfeng.wang@...aro.org>
> 
> gcc-8 reports
> 
> drivers/hid/uhid.c: In function 'uhid_dev_create2':
> ./include/linux/string.h:245:9: warning: '__builtin_strncpy' output may
> be truncated copying 127 bytes from a string of length 127
> [-Wstringop-truncation]
> 
> The compiler require that the input param 'len' of strncpy() should be
> greater than the length of the src string, so that '\0' is copied as
> well. We can just use strlcpy() to avoid this warning.

Applied to for-4.17/upstream.

-- 
Jiri Kosina
SUSE Labs