linux-kernel - [BUG] drivers/input/misc/pcap: a possible sleep-in-atomic bug in pcap_keys

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Message-ID: <9af81fe8-e07c-9161-2d85-3eb23a198ec9@gmail.com>
Date:   Tue, 12 Dec 2017 16:32:01 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     dmitry.torokhov@...il.com, ilya.muromec@...il.com
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUG] drivers/input/misc/pcap: a possible sleep-in-atomic bug in
 pcap_keys_handler

According to drivers/input/misc/pcap_keys.c, the kernel module may sleep 
in the interrupt handler.
The function call path is:
pcap_keys_handler (interrupt handler)
   ezx_pcap_read
     mutex_lock --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and checked 
by my code review.


Thanks,
Jia-Ju Bai