linux-kernel - Re: [PATCH] ASoC: soc-pcm: fix fe and be race when accessing substream->runtime

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Date:   Tue, 27 Sep 2022 13:56:19 +0200
From:   Eugeniu Rosca <erosca@...adit-jv.com>
To:     Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
CC:     Eugeniu Rosca <erosca@...adit-jv.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>,
        Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
        Eugeniu Rosca <roscaeugeniu@...il.com>,
        Jiada Wang <jiada_wang@...tor.com>,
        Zhang Yanmin <yanmin.zhang@...el.com>,
        Ramesh Babu <ramesh.babu@...el.com>,
        Dean Jenkins <Dean_Jenkins@...tor.com>,
        Ramesh Babu B <ramesh.babu.b@...el.com>,
        xiao jin <jin.xiao@...el.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>
Subject: Re: [PATCH] ASoC: soc-pcm: fix fe and be race when accessing
 substream->runtime

Hello Amadeusz,

On Di, Sep 27, 2022 at 09:34:49 +0200, Amadeusz Sławiński wrote:
> On 9/26/2022 6:35 PM, Eugeniu Rosca wrote:
> >From: xiao jin <jin.xiao@...el.com>
> >
> >After start of fe and be, fe might go to close without triggering
> >STOP, and substream->runtime is freed. However, be is still at
> >START state and its substream->runtime still points to the
> >freed runtime.
> >
> 
> Well if it is being freed, maybe pointer should be set to NULL instead in
> place that happens?
> 

As soon as the agreement is reached that the patch is still
relevant/useful on the latest vanilla, I think this review
finding will receive proper attention.

Thanks,
Eugeniu