From 34e7434ba4e97f4b85c1423a59b2922ba7dff2ea Mon Sep 17 00:00:00 2001 From: Zou Wei Date: Wed, 12 May 2021 15:00:24 +0800 Subject: atm: nicstar: Fix possible use-after-free in nicstar_cleanup() 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 Signed-off-by: Zou Wei Signed-off-by: David S. Miller --- drivers/atm/nicstar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/atm') diff --git a/drivers/atm/nicstar.c b/drivers/atm/nicstar.c index 5c7e4df159b9..b015c3e14336 100644 --- a/drivers/atm/nicstar.c +++ b/drivers/atm/nicstar.c @@ -299,7 +299,7 @@ static void __exit nicstar_cleanup(void) { XPRINTK("nicstar: nicstar_cleanup() called.\n"); - del_timer(&ns_timer); + del_timer_sync(&ns_timer); pci_unregister_driver(&nicstar_driver); -- cgit v1.2.3-59-g8ed1b