linux-kernel - Re: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy

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Date:   Sat, 6 Jun 2020 09:42:50 +0800
From:   Zhangfei Gao <zhangfei.gao@...aro.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        wangzhou1 <wangzhou1@...ilicon.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        kbuild-all@...ts.01.org
Subject: Re: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy



On 2020/6/5 下午11:49, Eric Biggers wrote:
> On Fri, Jun 05, 2020 at 11:26:20PM +0800, Zhangfei Gao wrote:
>>
>> On 2020/6/5 下午8:17, Herbert Xu wrote:
>>> On Fri, Jun 05, 2020 at 05:34:32PM +0800, Zhangfei Gao wrote:
>>>> Will add a check after the copy.
>>>>
>>>>           strlcpy(interface.name, pdev->driver->name, sizeof(interface.name));
>>>>           if (strlen(pdev->driver->name) != strlen(interface.name))
>>>>                   return -EINVAL;
>>> You don't need to do strlen.  The function strlcpy returns the
>>> length of the source string.
>>>
>>> Better yet use strscpy which will even return an error for you.
>>>
>>>
>> Yes, good idea, we can use strscpy.
>>
>> +       int ret;
>>
>> -       strncpy(interface.name, pdev->driver->name, sizeof(interface.name));
>> +       ret = strscpy(interface.name, pdev->driver->name,
>> sizeof(interface.name));
>> +       if (ret < 0)
>> +               return ret;
> You might want to use -ENAMETOOLONG instead of the strscpy return value of
> -E2BIG.
Yes, make sense, thanks Eric