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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drivers/net/ethernet/xircom/xirc2ps_cs.c

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