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authorZou Wei <zou_wei@huawei.com>2021-05-12 14:57:56 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-20 16:05:47 +0200
commit66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 (patch)
tree4c1694912d931b14d6d3d60ae1898ac26a252c39 /tools
parenta173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 (diff)
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watchdog: Fix possible use-after-free by calling del_timer_sync()
[ Upstream commit d0212f095ab56672f6f36aabc605bda205e1e0bf ] This driver'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> Acked-by: Vladimir Zapolskiy <vz@mleia.com> Link: https://lore.kernel.org/r/1620802676-19701-1-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> Signed-off-by: Sasha Levin <sashal@kernel.org>
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