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authorZou Wei <zou_wei@huawei.com>2021-05-11 10:04:51 +0300
committerWim Van Sebroeck <wim@linux-watchdog.org>2021-06-21 09:49:02 +0300
commit90b7c141132244e8e49a34a4c1e445cce33e07f4 (patch)
tree657ee950c4182af35627799f552e306290e76cbb /drivers/watchdog
parent6ddf5087f8022847556a4fec1d37a613f7e395d5 (diff)
downloadlinux-90b7c141132244e8e49a34a4c1e445cce33e07f4.tar.xz
watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Zou Wei <zou_wei@huawei.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/1620716691-108460-1-git-send-email-zou_wei@huawei.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/sc520_wdt.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/watchdog/sc520_wdt.c b/drivers/watchdog/sc520_wdt.c
index e66e6b905964..ca65468f4b9c 100644
--- a/drivers/watchdog/sc520_wdt.c
+++ b/drivers/watchdog/sc520_wdt.c
@@ -186,7 +186,7 @@ static int wdt_startup(void)
static int wdt_turnoff(void)
{
/* Stop the timer */
- del_timer(&timer);
+ del_timer_sync(&timer);
/* Stop the watchdog */
wdt_config(0);