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Subject: Re: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy
To:     Herbert Xu <herbert@gondor.apana.org.au>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        wangzhou1 <wangzhou1@hisilicon.com>,
        linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
        kbuild-all@lists.01.org
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From:   Zhangfei Gao <zhangfei.gao@linaro.org>
Message-ID: <47b747d2-3b27-4f39-85c9-204c2b8a92e1@linaro.org>
Date:   Fri, 5 Jun 2020 23:26:20 +0800
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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;

Will resend later, thanks Herbert.