linux-kernel - Re: [PATCH] xfrm: Use spin_lock_bh() in xfrm

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Message-ID: <ZYAqrDSp6QuKv5I0@gauss3.secunet.de>
Date: Mon, 18 Dec 2023 12:19:08 +0100
From: Steffen Klassert <steffen.klassert@...unet.com>
To: Eric Dumazet <edumazet@...gle.com>
CC: Zhang Yiqun <zhangyiqun@...tium.com.cn>, <herbert@...dor.apana.org.au>,
	<davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xfrm: Use spin_lock_bh() in xfrm_input()

On Mon, Dec 18, 2023 at 12:07:50PM +0100, Eric Dumazet wrote:
> On Mon, Dec 18, 2023 at 9:43 AM Zhang Yiqun <zhangyiqun@...tium.com.cn> wrote:
> >
> > This patch is to change spin_lock() into spin_lock_bh(), which can
> > disable bottem half in calling. If we leave this as spin_lock(),
> > it may stuck in a deadlock, because the callback in bottem half in
> > crypto driver will also call xfrm_input() again.
> >
> > Signed-off-by: Zhang Yiqun <zhangyiqun@...tium.com.cn>
> 
> When was the bug added ?
> We need a FIxes: tag.

This looks more like a 'crypto driver' bug. xfrm_input() runs in
the RX path and therefore expects to run with BHs off.