linux-kernel - [PATCH AUTOSEL 5.4 09/74] atm: iphase: fix possible use-after-free in ia_module

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Message-Id: <20210706112502.2064236-9-sashal@kernel.org>
Date:   Tue,  6 Jul 2021 07:23:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zou Wei <zou_wei@...wei.com>, Hulk Robot <hulkci@...wei.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>,
        linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 09/74] atm: iphase: fix possible use-after-free in ia_module_exit()

From: Zou Wei <zou_wei@...wei.com>

[ 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@...wei.com>
Signed-off-by: Zou Wei <zou_wei@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 8c7a996d1f16..46990352b5d3 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -3295,7 +3295,7 @@ 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);
-- 
2.30.2