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Code Issues Releases Wiki Activity

xirc2ps_cs: Fix use after free bug in xirc2ps_detach

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In xirc2ps_probe, the local->tx_timeout_task was bounded
with xirc2ps_tx_timeout_task. When timeout occurs,
it will call xirc_tx_timeout->schedule_work to start the
work.

When we call xirc2ps_detach to remove the driver, there
may be a sequence as follows:

Stop responding to timeout tasks and complete scheduled
tasks before cleanup in xirc2ps_detach, which will fix
the problem.

CPU0                  CPU1

                    |xirc2ps_tx_timeout_task
xirc2ps_detach      |
  free_netdev       |
    kfree(dev);     |
                    |
                    | do_reset
                    |   //use dev

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zheng Wang 2023-03-17 00:15:26 +08:00 committed by David S. Miller
parent 25143b6a01
commit e8d20c3ded
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/xircom/xirc2ps_cs.c
View file

@ -503,6 +503,11 @@ static void
xirc2ps_detach(struct pcmcia_device *link)
{
struct net_device *dev = link->priv;
struct local_info *local = netdev_priv(dev);
netif_carrier_off(dev);
netif_tx_disable(dev);
cancel_work_sync(&local->tx_timeout_task);
dev_dbg(&link->dev, "detach\n");