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:   Thu, 16 Feb 2017 09:42:02 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Ben Hutchings <ben@...adent.org.uk>
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

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 ...")
    Reported-by: Daniel Borkmann <daniel@...earbox.net>
    Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

Thanks
Hangbin