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Message-Id: <20240915144045.451-1-kxwang23@m.fudan.edu.cn>
Date: Sun, 15 Sep 2024 22:40:46 +0800
From: Kaixin Wang <kxwang23@...udan.edu.cn>
To: davem@...emloft.net
Cc: wtdeng24@...udan.edu.cn,
21210240012@...udan.edu.cn,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
edumazet@...gle.com,
kuba@...nel.org,
przemyslaw.kitszel@...el.com,
pabeni@...hat.com,
Kaixin Wang <kxwang23@...udan.edu.cn>
Subject: [PATCH net v2] net: seeq: Fix use after free vulnerability in ether3 Driver Due to Race Condition
In the ether3_probe function, a timer is initialized with a callback
function ether3_ledoff, bound to &prev(dev)->timer. Once the timer is
started, there is a risk of a race condition if the module or device
is removed, triggering the ether3_remove function to perform cleanup.
The sequence of operations that may lead to a UAF bug is as follows:
CPU0 CPU1
| ether3_ledoff
ether3_remove |
free_netdev(dev); |
put_devic |
kfree(dev); |
| ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
| // use dev
Fix it by ensuring that the timer is canceled before proceeding with
the cleanup in ether3_remove.
Fixes: 6fd9c53f7186 ("net: seeq: Convert timers to use timer_setup()")
Signed-off-by: Kaixin Wang <kxwang23@...udan.edu.cn>
---
v2:
- turn the LED off before delete the timer, suggested by Przemek
- add Fixes tag
- Link to v1: https://lore.kernel.org/r/20240909175821.2047-1-kxwang23@m.fudan.edu.cn
---
drivers/net/ethernet/seeq/ether3.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/seeq/ether3.c b/drivers/net/ethernet/seeq/ether3.c
index c672f92d65e9..9319a2675e7b 100644
--- a/drivers/net/ethernet/seeq/ether3.c
+++ b/drivers/net/ethernet/seeq/ether3.c
@@ -847,9 +847,11 @@ static void ether3_remove(struct expansion_card *ec)
{
struct net_device *dev = ecard_get_drvdata(ec);
+ ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
ecard_set_drvdata(ec, NULL);
unregister_netdev(dev);
+ del_timer_sync(&priv(dev)->timer);
free_netdev(dev);
ecard_release_resources(ec);
}
--
2.39.1.windows.1
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