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

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Date:   Sat, 8 Aug 2020 12:50:15 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'luobin (L)'" <luobin9@...wei.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

From: luobin (L)
> Sent: 08 August 2020 04:37
> 
> 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
>
> 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?

If you can't see it you probably shouldn't be submitting patches....

Consider what happens when the string is long.

	David

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