linux-kernel - Re: [PATCH -next] net: hns3: replace snprintf with scnprintf in hns3_dbg_cmd

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Message-ID: <dbd54fd8-b356-18a2-cb16-ad3aaaa933ca@huawei.com>
Date:   Mon, 20 Jan 2020 10:37:01 +0800
From:   Chen Zhou <chenzhou10@...wei.com>
To:     tanhuazhong <tanhuazhong@...wei.com>, <yisen.zhuang@...wei.com>,
        <salil.mehta@...wei.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] net: hns3: replace snprintf with scnprintf in
 hns3_dbg_cmd_read



On 2020/1/20 9:28, tanhuazhong wrote:
> 
> 
> On 2020/1/19 20:41, Chen Zhou wrote:
>> The return value of snprintf may be greater than the size of
>> HNS3_DBG_READ_LEN, use scnprintf instead in hns3_dbg_cmd_read.
>>
>> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
>> ---
>>   drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
>> index 6b328a2..8fad699 100644
>> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
>> @@ -297,7 +297,7 @@ static ssize_t hns3_dbg_cmd_read(struct file *filp, char __user *buffer,
>>       if (!buf)
>>           return -ENOMEM;
>>   -    len = snprintf(buf, HNS3_DBG_READ_LEN, "%s\n",
>> +    len = scnprintf(buf, HNS3_DBG_READ_LEN, "%s\n",
>>                  "Please echo help to cmd to get help information");
> 
> not align?

Ok, i will fix in next version.

Thanks,
Chen Zhou

> 
>>       uncopy_bytes = copy_to_user(buffer, buf, len);
>>  
> 
> 
> .
>