linux-kernel - [BUG] usb: serial: garmin_gps: A possible concurrency use-after-free bug

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Message-ID: <8b24e2fc-df9a-8e06-aa49-a27675fd36e9@gmail.com>
Date:   Thu, 20 Dec 2018 21:41:16 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     Johan Hovold <johan@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] usb: serial: garmin_gps: A possible concurrency use-after-free
 bug

In drivers/usb/serial/garmin_gps.c,
the functions garmin_read_bulk_callback() and garmin_write_bulk_callback()
may be concurrently executed.

In garmin_write_bulk_callback() on line 969:
     kfree(urb->transfer_buffer);
In garmin_read_bulk_callback() on line 1165:
     unsigned char *data = urb->transfer_buffer;
Thus, a concurrency use-after-free bug may occur.

This possible bug is found by a static analysis tool written by myself.


Best wishes,
Jia-Ju Bai