linux-kernel - [BUG] sound/core/seq: A possible sleep-in-atomic bug in snd_virmidi_dev_receive

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Date:   Mon, 9 Oct 2017 10:42:15 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     perex@...ex.cz, tiwai@...e.com, o-takashi@...amocchi.jp,
        mingo@...nel.org, danielmentz@...gle.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [BUG] sound/core/seq: A possible sleep-in-atomic bug in
 snd_virmidi_dev_receive_event

According to seq_virmidi.c, the driver may sleep under a read spinlock.
The function call path is:
snd_virmidi_dev_receive_event (acquire the spinlock)
   snd_seq_dump_var_event
     copy_from_user --> may sleep

This bug is found by my static analysis tool and my code review.


Thanks,
Jia-Ju Bai