linux-kernel - Re: [PATCH 3.2 086/126] igmp: do not remove igmp souce list info when set link down

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Date:   Mon, 06 Mar 2017 19:00:41 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 3.2 086/126] igmp: do not remove igmp souce list info
 when set link down

On Thu, 2017-02-16 at 09:42 +0800, Hangbin Liu wrote:
> > 2017-02-16 6:41 GMT+08:00 Ben Hutchings <ben@...adent.org.uk>:
> > 3.2.85-rc1 review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Hangbin Liu <liuhangbin@...il.com>
> > 
> > commit 24803f38a5c0b6c57ed800b47e695f9ce474bc3a upstream.
> > 
> > In commit 24cf3af3fed5 ("igmp: call ip_mc_clear_src..."), we forgot to remove
> > igmpv3_clear_delrec() in ip_mc_down(), which also called ip_mc_clear_src().
> > This make us clear all IGMPv3 source filter info after NETDEV_DOWN.
> > Move igmpv3_clear_delrec() to ip_mc_destroy_dev() and then no need
> > ip_mc_clear_src() in ip_mc_destroy_dev().
> > 
> > On the other hand, we should restore back instead of free all source filter
> > info in igmpv3_del_delrec(). Or we will not able to restore IGMPv3 source
> > filter info after NETDEV_UP and NETDEV_POST_TYPE_CHANGE.
> > 
> > Fixes: 24cf3af3fed5 ("igmp: call ip_mc_clear_src() only when ...")
> > Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> > Signed-off-by: David S. Miller <davem@...emloft.net>
> > [bwh: Backported to 3.2:
> >  - Use IGMP_Unsolicited_Report_Count instead of sysctl_igmp_qrv
> >  - Adjust context]
> > Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> 
> Hi Ben,
> 
> There is a bug fix for this patch, please consider drop this patch or
> include the fix.
> 
> commit 9c8bb163ae784be4f79ae504e78c862806087c54
> Author: Hangbin Liu <liuhangbin@...il.com>
> Date:   Wed Feb 8 21:16:45 2017 +0800
> 
>     igmp, mld: Fix memory leak in igmpv3/mld_del_delrec()
> 
>     In function igmpv3/mld_add_delrec() we allocate pmc and put it in
>     idev->mc_tomb, so we should free it when we don't need it in del_delrec().
>     But I removed kfree(pmc) incorrectly in latest two patches. Now fix it.
> 
>     Fixes: 24803f38a5c0 ("igmp: do not remove igmp souce list info when ...")
>     Fixes: 1666d49e1d41 ("mld: do not remove mld souce list info when ...")
[...]

I've now queued up all 3 fixes for the next updates to 3.2 and 3.16.

Ben.

-- 
Ben Hutchings
Unix is many things to many people,
but it's never been everything to anybody.


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