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net: seeq: Fix use after free vulnerability in ether3 Driver Due to Race Condition

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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: 6fd9c53f71 ("net: seeq: Convert timers to use timer_setup()")
Signed-off-by: Kaixin Wang <kxwang23@m.fudan.edu.cn>
Link: https://patch.msgid.link/20240915144045.451-1-kxwang23@m.fudan.edu.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kaixin Wang 2024-09-15 22:40:46 +08:00 committed by Paolo Abeni
parent 9c778fe48d
commit b5109b60ee
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/seeq/ether3.c
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@ -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);
}