linux-kernel - [BUG] sound: pci: trident: a possible data race

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Date:   Wed, 3 Oct 2018 20:50:25 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     perex@...ex.cz, tiwai@...e.com, keescook@...omium.org
Cc:     alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] sound: pci: trident: a possible data race

CPU0:
snd_trident_hw_free
     snd_trident_free_voice
             line 3870: spin_lock_irqsave()
             line 3881: voice->substream = NULL; [WRITE]
CPU1:
snd_trident_interrupt
     line 3798: snd_pcm_period_elapsed(voice->substream);  [READ]

As for voice->substream, the WRITE operation in CPU0 is performed
with holding a spinlock, but the READ operation in CPU1 is performed
without holding this spinlock, so there may exist a data race.


Best wishes,
Jia-Ju Bai