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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sven Van Asbroeck <thesven73@gmail.com>,
	Sven Van Asbroeck <TheSven73@gmail.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-rtc@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 08/92] rtc: 88pm860x: prevent use-after-free on device remove
Date: Wed, 22 May 2019 15:30:03 -0400	[thread overview]
Message-ID: <20190522193127.27079-8-sashal@kernel.org> (raw)
In-Reply-To: <20190522193127.27079-1-sashal@kernel.org>

From: Sven Van Asbroeck <thesven73@gmail.com>

[ Upstream commit f22b1ba15ee5785aa028384ebf77dd39e8e47b70 ]

The device's remove() attempts to shut down the delayed_work scheduled
on the kernel-global workqueue by calling flush_scheduled_work().

Unfortunately, flush_scheduled_work() does not prevent the delayed_work
from re-scheduling itself. The delayed_work might run after the device
has been removed, and touch the already de-allocated info structure.
This is a potential use-after-free.

Fix by calling cancel_delayed_work_sync() during remove(): this ensures
that the delayed work is properly cancelled, is no longer running, and
is not able to re-schedule itself.

This issue was detected with the help of Coccinelle.

Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/rtc/rtc-88pm860x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-88pm860x.c b/drivers/rtc/rtc-88pm860x.c
index 19e53b3b8e005..166faae3a59cd 100644
--- a/drivers/rtc/rtc-88pm860x.c
+++ b/drivers/rtc/rtc-88pm860x.c
@@ -414,7 +414,7 @@ static int pm860x_rtc_remove(struct platform_device *pdev)
 	struct pm860x_rtc_info *info = platform_get_drvdata(pdev);
 
 #ifdef VRTC_CALIBRATION
-	flush_scheduled_work();
+	cancel_delayed_work_sync(&info->calib_work);
 	/* disable measurement */
 	pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
 #endif	/* VRTC_CALIBRATION */
-- 
2.20.1


  parent reply	other threads:[~2019-05-22 19:34 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-22 19:29 [PATCH AUTOSEL 4.4 01/92] gfs2: Fix lru_count going negative Sasha Levin
2019-05-22 19:29 ` [PATCH AUTOSEL 4.4 02/92] cxgb4: Fix error path in cxgb4_init_module Sasha Levin
2019-05-22 19:29 ` [PATCH AUTOSEL 4.4 03/92] mmc: core: Verify SD bus width Sasha Levin
2019-05-22 19:29 ` [PATCH AUTOSEL 4.4 04/92] powerpc/boot: Fix missing check of lseek() return value Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 05/92] ASoC: imx: fix fiq dependencies Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 06/92] spi: pxa2xx: fix SCR (divisor) calculation Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 07/92] brcm80211: potential NULL dereference in brcmf_cfg80211_vndr_cmds_dcmd_handler() Sasha Levin
2019-05-22 19:30 ` Sasha Levin [this message]
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 09/92] w1: fix the resume command API Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 10/92] dmaengine: pl330: _stop: clear interrupt status Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 11/92] mac80211/cfg80211: update bss channel on channel switch Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 12/92] driver core: platform: Fix the usage of platform device name(pdev->name) Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 13/92] ASoC: fsl_sai: Update is_slave_mode with correct value Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 14/92] mwifiex: prevent an array overflow Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 15/92] net: cw1200: fix a NULL pointer dereference Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 16/92] at76c50x-usb: Don't register led_trigger if usb_register_driver failed Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 17/92] ssb: Fix possible NULL pointer dereference in ssb_host_pcmcia_exit Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 18/92] bcache: return error immediately in bch_journal_replay() Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 19/92] bcache: fix failure in journal relplay Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 20/92] bcache: add failure check to run_cache_set() for journal replay Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 21/92] bcache: avoid clang -Wunintialized warning Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 22/92] RDMA/cma: Consider scope_id while binding to ipv6 ll address Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 23/92] x86/build: Move _etext to actual end of .text Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 24/92] smpboot: Place the __percpu annotation correctly Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 25/92] x86/mm: Remove in_nmi() warning from 64-bit implementation of vmalloc_fault() Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 26/92] mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 27/92] HID: logitech-hidpp: use RAP instead of FAP to get the protocol version Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 28/92] pinctrl: pistachio: fix leaked of_node references Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 29/92] dmaengine: at_xdmac: remove BUG_ON macro in tasklet Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 30/92] media: coda: clear error return value before picture run Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 31/92] media: ov6650: Move v4l2_clk_get() to ov6650_video_probe() helper Sasha Levin
2019-05-22 19:30 ` [PATCH AUTOSEL 4.4 32/92] media: au0828: stop video streaming only when last user stops Sasha Levin

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