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

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Message-Id: <20200806.120103.1200684111953914586.davem@davemloft.net>
Date:   Thu, 06 Aug 2020 12:01:03 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     luobin9@...wei.com
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

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.