netdev - Re: [PATCH net] net: bridge: mcast: wait for previous gc cycles when removing port

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Message-Id: 
 <172290205386.12421.6444083492470398504.git-patchwork-notify@kernel.org>
Date: Mon, 05 Aug 2024 23:54:13 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Nikolay Aleksandrov <razor@...ckwall.org>
Cc: netdev@...r.kernel.org, kuba@...nel.org, roopa@...dia.com,
 bridge@...ts.linux.dev, edumazet@...gle.com, pabeni@...hat.com,
 syzbot+263426984509be19c9a0@...kaller.appspotmail.com
Subject: Re: [PATCH net] net: bridge: mcast: wait for previous gc cycles when
 removing port

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Fri,  2 Aug 2024 11:07:30 +0300 you wrote:
> syzbot hit a use-after-free[1] which is caused because the bridge doesn't
> make sure that all previous garbage has been collected when removing a
> port. What happens is:
>       CPU 1                   CPU 2
>  start gc cycle           remove port
>                          acquire gc lock first
>  wait for lock
>                          call br_multicasg_gc() directly
>  acquire lock now but    free port
>  the port can be freed
>  while grp timers still
>  running
> 
> [...]

Here is the summary with links:
  - [net] net: bridge: mcast: wait for previous gc cycles when removing port
    https://git.kernel.org/netdev/net/c/92c4ee25208d

You are awesome, thank you!
-- 
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