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

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Message-ID: <7f9e241e-3ad6-b250-11b1-a16d1dc2df68@huawei.com>
Date:   Fri, 7 Aug 2020 08:57:15 +0800
From:   "luobin (L)" <luobin9@...wei.com>
To:     David Miller <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <luoxianjun@...wei.com>, <yin.yinshi@...wei.com>,
        <cloud.wangxiaoyun@...wei.com>, <chiqijun@...wei.com>
Subject: Re: [PATCH net-next] hinic: fix strncpy output truncated compile
 warnings

On 2020/8/7 3:01, David Miller wrote:
> From: Luo bin <luobin9@...wei.com>
> Date: Thu, 6 Aug 2020 15:48:30 +0800
> 
>> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
>> index c6adc776f3c8..1dc948c07b94 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);
>>  	else
>> -		strncpy(level_str, "Unknown", strlen("Unknown"));
>> +		strncpy(level_str, "Unknown", sizeof(level_str));
>>  
>>  	if (level == FAULT_LEVEL_SERIOUS_FLR) {
> 
> Please fix these cases consistently, either use the strlen()+1 pattern
> or the "sizeof(destination)" one.
> 
> Probably sizeof(destination) is best.
> .
> 
Will fix. Thanks. Level_str array is initialized to zero, so can't use the strlen()+1 pattern, I'll
use strlen()+1 consistently.