linux-kernel - Re: [PATCH net-next v1] hinic: fix strncpy output truncated compile warnings

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Date:   Sat, 8 Aug 2020 11:36:42 +0800
From:   "luobin (L)" <luobin9@...wei.com>
To:     David Laight <David.Laight@...LAB.COM>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "luoxianjun@...wei.com" <luoxianjun@...wei.com>,
        "yin.yinshi@...wei.com" <yin.yinshi@...wei.com>,
        "cloud.wangxiaoyun@...wei.com" <cloud.wangxiaoyun@...wei.com>,
        "chiqijun@...wei.com" <chiqijun@...wei.com>
Subject: Re: [PATCH net-next v1] hinic: fix strncpy output truncated compile
 warnings

On 2020/8/7 17:32, David Laight wrote:
> From: Luo bin
>> Sent: 07 August 2020 03:09
>>
>> fix the compile warnings of 'strncpy' output truncated before
>> terminating nul copying N bytes from a string of the same length
>>
>> Signed-off-by: Luo bin <luobin9@...wei.com>
>> Reported-by: kernel test robot <lkp@...el.com>
>> ---
>> V0~V1:
>> - use the strlen()+1 pattern consistently
>>
>>  drivers/net/ethernet/huawei/hinic/hinic_devlink.c | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
>> b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
>> index c6adc776f3c8..1ec88ebf81d6 100644
>> --- a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
>> +++ b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
>> @@ -342,9 +342,9 @@ static int chip_fault_show(struct devlink_fmsg *fmsg,
>>
>>  	level = event->event.chip.err_level;
>>  	if (level < FAULT_LEVEL_MAX)
>> -		strncpy(level_str, fault_level[level], strlen(fault_level[level]));
>> +		strncpy(level_str, fault_level[level], strlen(fault_level[level]) + 1);
> 
> Have you even considered what that code is actually doing?
> 
> 	David
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)
> 
> .
> 
I'm sorry that I haven't got what you mean and I haven't found any defects in that code. Can you explain more to me?