netdev - Re: [Suggestion] net/atm : for sprintf, need check the total write length whether larger than a page.

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Message-ID: <50C1415C.2060104@asianux.com>
Date:	Fri, 07 Dec 2012 09:07:40 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	chas williams - CONTRACTOR <chas@....nrl.navy.mil>
CC:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [Suggestion] net/atm : for sprintf, need check the total write
 length whether larger than a page.

于 2012年12月06日 22:08, chas williams - CONTRACTOR 写道:
> On Thu, 06 Dec 2012 09:15:10 +0800
> Chen Gang <gang.chen@...anux.com> wrote:
> 
>> 于 2012年12月05日 22:55, chas williams - CONTRACTOR 写道:
> 
>>> did you mean '\0' instead of '\n'?  scnprintf() considers the trailing
>>> '\0' when formatting.
>>
>>   no, originally, the end is "\n\0".
>>
>>   I prefer we still compatible "\n" when the contents are very large.
>>   if count already == (PAGE_SIZE - 1), we have no chance to append "\n" to the end.
>>
>> -		pos += sprintf(pos, "\n");
>> +		count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
> 
> i would make the code a bit messy to do this for not much gain.  again,
> it isnt likely you would run into this in a normal situation.

  surely.

  thanks.

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> 


-- 
Chen Gang

Asianux Corporation
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