netdev - Re: [PATCH] ipv6: release referenct of ip6_null_entry's dst entry in __ip6_del

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Message-ID: <506CFA96.4050207@cn.fujitsu.com>
Date:	Thu, 04 Oct 2012 10:55:18 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: release referenct of ip6_null_entry's dst entry
 in __ip6_del_rt

于 2012年09月24日 12:32, Gao feng 写道:
> 于 2012年09月22日 01:16, David Miller 写道:
>> From: Gao feng <gaofeng@...fujitsu.com>
>> Date: Thu, 20 Sep 2012 13:25:34 +0800
>>
>>> as we hold dst_entry before we call __ip6_del_rt,
>>> so we should alse call dst_release not only return
>>> -ENOENT when the rt6_info is ip6_null_entry.
>>>
>>> and we already hold the dst entry, so I think it's
>>> safe to call dst_release out of the write-read lock.
>>>
>>> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
>>
>> I cannot find a code path where we can actually end up
>> with an ip6_null_entry here and I'd much rather declare
>> this condition as a bug.
>>
>> Patrick McHardy added this check back in 2006:
>>
>> 	commit 6c813a7297e3af4cd7c3458e09e9ee3d161c6830
>> 	Author: Patrick McHardy <kaber@...sh.net>
>> 	Date:   Sun Aug 6 22:22:47 2006 -0700
>>
>> 	    [IPV6]: Fix crash in ip6_del_rt
>>
>> But the ipv6 code has changed substantially since then.
> 
> ip -6 route del ::/0 will end up with an ip6_null_entry.
> so I think this checking and this patch is needed .
> 

Hi David

Can you apply this patch?
thanks!

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