From 1c72e6ab66b9598cac741ed397438a52065a8f1f Mon Sep 17 00:00:00 2001 From: Zou Wei Date: Tue, 11 May 2021 14:53:36 +0800 Subject: [PATCH] atm: iphase: fix possible use-after-free in ia_module_exit() 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/iphase.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c index e3f5d073caa6..bc8e8d9f176b 100644 --- a/drivers/atm/iphase.c +++ b/drivers/atm/iphase.c @@ -3282,7 +3282,7 @@ static void __exit ia_module_exit(void) { pci_unregister_driver(&ia_driver); - del_timer(&ia_timer); + del_timer_sync(&ia_timer); } module_init(ia_module_init);