Ioanna Alifieraki c4618188b1 ipmi: Move remove_work to dedicated workqueue ... commit 1d49eb91e8 upstream. Currently when removing an ipmi_user the removal is deferred as a work on the system's workqueue. Although this guarantees the free operation will occur in non atomic context, it can race with the ipmi_msghandler module removal (see [1]) . In case a remove_user work is scheduled for removal and shortly after ipmi_msghandler module is removed we can end up in a situation where the module is removed fist and when the work is executed the system crashes with : BUG: unable to handle page fault for address: ffffffffc05c3450 PF: supervisor instruction fetch in kernel mode PF: error_code(0x0010) - not-present page because the pages of the module are gone. In cleanup_ipmi() there is no easy way to detect if there are any pending works to flush them before removing the module. This patch creates a separate workqueue and schedules the remove_work works on it. When removing the module the workqueue is drained when destroyed to avoid the race. [1] https://bugs.launchpad.net/bugs/1950666 Cc: stable@vger.kernel.org # 5.1 Fixes: 3b9a907223 (ipmi: fix sleep-in-atomic in free_user at cleanup SRCU user->release_barrier) Signed-off-by: Ioanna Alifieraki <ioanna-maria.alifieraki@canonical.com> Message-Id: <20211115131645.25116-1-ioanna-maria.alifieraki@canonical.com> Signed-off-by: Corey Minyard <cminyard@mvista.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-12-08 09:04:42 +01:00
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agp
hw_random	hwrng: mtk - Force runtime pm ops for sleep ops	2021-11-18 19:16:31 +01:00
ipmi	ipmi: Move remove_work to dedicated workqueue	2021-12-08 09:04:42 +01:00
mwave	char: mware: fix returnvar.cocci warnings	2021-08-27 16:20:37 +02:00
pcmcia	TTY / Serial patches for 5.15-rc1	2021-09-01 09:51:16 -07:00
tpm	tpm_tis_spi: Add missing SPI ID	2021-11-18 19:16:41 +01:00
xilinx_hwicap
xillybus	char: xillybus: fix msg_ep UAF in xillyusb_probe()	2021-11-18 19:15:52 +01:00
adi.c
apm-emulation.c
applicom.c
applicom.h
bsr.c
ds1620.c
dsp56k.c
dtlk.c
hangcheck-timer.c
hpet.c
Kconfig	char: move RANDOM_TRUST_CPU & RANDOM_TRUST_BOOTLOADER into the Character devices menu	2021-08-16 19:02:19 +02:00
lp.c
Makefile
mem.c
misc.c
mspec.c
nsc_gpio.c
nvram.c
nwbutton.c
nwbutton.h
nwflash.c
pc8736x_gpio.c
powernv-op-panel.c	powerpc/powernv: Fix fall-through warning for Clang	2021-07-13 19:21:41 -05:00
ppdev.c
ps3flash.c
random.c
scx200_gpio.c
sonypi.c
tb0219.c
tlclk.c
toshiba.c
ttyprintk.c	tty: drop put_tty_driver	2021-07-27 12:17:21 +02:00
uv_mmtimer.c
virtio_console.c	virtio_console: Assure used length from device is limited	2021-07-03 04:50:53 -04:00