linux/drivers/auxdisplay
Miguel Ojeda 69ef9bc547 auxdisplay: ht16k33: fix potential user-after-free on module unload
On module unload/remove, we need to ensure that work does not run
after we have freed resources. Concretely, cancel_delayed_work()
may return while the callback function is still running.

From kernel/workqueue.c:

    The work callback function may still be running on return,
    unless it returns true and the work doesn't re-arm itself.
    Explicitly flush or use cancel_delayed_work_sync() to wait on it.

Link: https://lore.kernel.org/lkml/20190204220952.30761-1-TheSven73@googlemail.com/
Reported-by: Sven Van Asbroeck <thesven73@gmail.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Sven Van Asbroeck <TheSven73@gmail.com>
Acked-by: Robin van der Gracht <robin@protonic.nl>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
2019-02-15 19:48:39 +01:00
..
Kconfig auxdisplay: make PANEL a menuconfig 2018-04-12 19:02:45 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
arm-charlcd.c auxdisplay: simplify getting .drvdata 2018-08-01 18:58:09 +02:00
cfag12864b.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
cfag12864bfb.c auxdisplay: Replace licenses with SPDX identifiers 2018-04-12 19:02:45 +02:00
charlcd.c auxdisplay: charlcd: fix x/y command parsing 2018-12-21 21:27:21 +01:00
hd44780.c gpiolib: Pass array info to get/set array functions 2018-09-13 11:16:54 +02:00
ht16k33.c auxdisplay: ht16k33: fix potential user-after-free on module unload 2019-02-15 19:48:39 +01:00
img-ascii-lcd.c auxdisplay: img-ascii-lcd: Silence 2 uninitialized warnings 2018-03-13 18:16:38 +01:00
ks0108.c auxdisplay: Replace licenses with SPDX identifiers 2018-04-12 19:02:45 +02:00
panel.c Compiler Attributes: auxdisplay: panel: use __nonstring 2018-09-30 20:14:04 +02:00