netdev - Re: ipv6: Do not depend on rt->n in rt6

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Date:	Tue, 22 Jan 2013 03:41:10 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	netdev@...r.kernel.org, kbuild@...org,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: ipv6: Do not depend on rt->n in rt6_probe().

(2013年01月22日 03:28), Dan Carpenter wrote:
> Hello YOSHIFUJI Hideaki / 吉藤英明,
> 
> This is a semi-automatic email about new static checker warnings.
> 
> The patch 2152caea7196: "ipv6: Do not depend on rt->n in 
> rt6_probe()." from Jan 17, 2013, leads to the following Smatch 
> complaint:
> 
> net/ipv6/route.c:495 rt6_probe()
> 	 error: we previously assumed 'neigh' could be null (see line 490)
> 
> net/ipv6/route.c
>    489	
>    490		if (!neigh ||
>                      ^^^^^
> New test.
> 
>    491		    time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
>    492			struct in6_addr mcaddr;
>    493			struct in6_addr *target;
>    494	
>    495			neigh->updated = jiffies;
>                         ^^^^^^^^^^^^^^
> Old dereference.
> 
>    496	
>    497			if (neigh)
>                             ^^^^^
> Another new test.

Oh, right, I'll fix.  Thanks!

--yoshfuji

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