This is a note to let you know that I've just added the patch titled atm: iphase: fix possible use-after-free in ia_module_exit() to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: atm-iphase-fix-possible-use-after-free-in-ia_module_.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit f7d7fc929be49fc8834eb326550fe210db830ada Author: Zou Wei <zou_wei@xxxxxxxxxx> Date: Tue May 11 14:53:36 2021 +0800 atm: iphase: fix possible use-after-free in ia_module_exit() [ Upstream commit 1c72e6ab66b9598cac741ed397438a52065a8f1f ] 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@xxxxxxxxxx> Signed-off-by: Zou Wei <zou_wei@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c index 008905d4152a..827c6d5e6177 100644 --- a/drivers/atm/iphase.c +++ b/drivers/atm/iphase.c @@ -3301,7 +3301,7 @@ 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);