linux-kernel - Re: [PATCH] net: ipv6: ensure we call ipv6_mc

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Date:   Mon, 28 Feb 2022 11:10:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     None <j.nixdorf@....de>
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        kuba@...nel.org, xiyou.wangcong@...il.com,
        hannes@...essinduktion.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ipv6: ensure we call ipv6_mc_down() at most once 

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Thu, 24 Feb 2022 10:06:49 +0100 you wrote:
> There are two reasons for addrconf_notify() to be called with NETDEV_DOWN:
> either the network device is actually going down, or IPv6 was disabled
> on the interface.
> 
> If either of them stays down while the other is toggled, we repeatedly
> call the code for NETDEV_DOWN, including ipv6_mc_down(), while never
> calling the corresponding ipv6_mc_up() in between. This will cause a
> new entry in idev->mc_tomb to be allocated for each multicast group
> the interface is subscribed to, which in turn leaks one struct ifmcaddr6
> per nontrivial multicast group the interface is subscribed to.
> 
> [...]

Here is the summary with links:
  - net: ipv6: ensure we call ipv6_mc_down() at most once
    https://git.kernel.org/netdev/net/c/9995b408f17f

You are awesome, thank you!
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