netdev - Re: [PATCH net] batman-adv: Hold rtnl lock during MTU update via netlink

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Date: Wed, 23 Aug 2023 00:30:24 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Sven Eckelmann <sven@...fation.org>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
 stable@...r.kernel.org, syzbot+f8812454d9b3ac00d282@...kaller.appspotmail.com
Subject: Re: [PATCH net] batman-adv: Hold rtnl lock during MTU update via
 netlink

Hello:

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

On Mon, 21 Aug 2023 21:48:48 +0200 you wrote:
> The automatic recalculation of the maximum allowed MTU is usually triggered
> by code sections which are already rtnl lock protected by callers outside
> of batman-adv. But when the fragmentation setting is changed via
> batman-adv's own batadv genl family, then the rtnl lock is not yet taken.
> 
> But dev_set_mtu requires that the caller holds the rtnl lock because it
> uses netdevice notifiers. And this code will then fail the check for this
> lock:
> 
> [...]

Here is the summary with links:
  - [net] batman-adv: Hold rtnl lock during MTU update via netlink
    https://git.kernel.org/netdev/net/c/987aae75fc10

You are awesome, thank you!
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