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authorZou Wei <zou_wei@huawei.com>2021-05-11 14:58:53 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-20 16:15:59 +0200
commit5f2818185da0fe82a932f0856633038b66faf124 (patch)
treee3266032f06fddc7f8d878fa3e908197841c6d48 /drivers/isdn
parent89ce0b0747f319eb70f85bc820dcc43cebbd5417 (diff)
mISDN: fix possible use-after-free in HFC_cleanup()
[ Upstream commit 009fc857c5f6fda81f2f7dd851b2d54193a8e733 ] 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> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/hardware/mISDN/hfcpci.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index ebb3fa2e1d00..53349850f866 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -2348,7 +2348,7 @@ static void __exit
HFC_cleanup(void)
{
if (timer_pending(&hfc_tl))
- del_timer(&hfc_tl);
+ del_timer_sync(&hfc_tl);
pci_unregister_driver(&hfc_driver);
}