[PATCH 5.15 292/691] net: seeq: Fix use after free vulnerability in ether3 Driver Due to Race Condition

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kaixin Wang <kxwang23@xxxxxxxxxxxxxx>

[ Upstream commit b5109b60ee4fcb2f2bb24f589575e10cc5283ad4 ]

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@xxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20240915144045.451-1-kxwang23@xxxxxxxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 16a4cbae93265..6bcb52118c11b 100644
--- a/drivers/net/ethernet/seeq/ether3.c
+++ b/drivers/net/ethernet/seeq/ether3.c
@@ -845,9 +845,11 @@ 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);
 }
-- 
2.43.0







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