linux-kernel - Re: [Patch] net: fix an array index overflow

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Date:	Thu, 03 Dec 2009 16:30:34 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Dan Carpenter <error27@...il.com>,
	Amerigo Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch] net: fix an array index overflow

Dan Carpenter wrote:
> On Tue, Dec 01, 2009 at 03:26:02AM -0500, Amerigo Wang wrote:
>> Don't use the address of an out-of-boundary element.
>>
>> Maybe this is not harmful at runtime, but it is still
>> good to improve it.
>>
>> Signed-off-by: WANG Cong <amwang@...hat.com>
>> Cc: David S. Miller <davem@...emloft.net>
>>
> 
> It may be coincidence but my static checker smatch also complains 
> about the code you modified.
> 
> It's the wrong idea to fix code to please a checker.  You end up
> doing things like adding an extra "return -ENOTREACHED" to silence
> warnings.  Then the next person who writes a checker has to figure
> out how to seperate the unreachable code which was added to suppress
> gcc warnings from bits which are unreachable because of typos.
> 
> Really any code that a human can read, a static checker should also
> be able to read.  Computer programs are just state machines.  At 
> the function level they are quite small state machines.  It's all
> logic and math which computers are very good at.  So it should be 
> fairly easy to fix the checker.  ;)
> 

Well, in some cases smatch seems really wrong, but not in this
case I think, or at least, smatch is suggesting us to improve
this code.

Please check Eric's reply in this thread, his patch looks nice
for me.

Thanks.

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