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| author | Zheng Wang <zyytlz.wz@163.com> | 2023-03-16 19:15:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-30 13:50:54 +0300 |
| commit | 9c515f3290456bb6850bd7ee29d5bf6652d7f103 (patch) | |
| tree | 41a0d1b822bc1ecd39d58740c86437ebd90614b3 | |
| parent | b224b0cab3a66e93d414825065a2e667a1d28c32 (diff) | |
| download | linux-9c515f3290456bb6850bd7ee29d5bf6652d7f103.tar.xz | |
xirc2ps_cs: Fix use after free bug in xirc2ps_detach
[ Upstream commit e8d20c3ded59a092532513c9bd030d1ea66f5f44 ]
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: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/ethernet/xircom/xirc2ps_cs.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/ethernet/xircom/xirc2ps_cs.c b/drivers/net/ethernet/xircom/xirc2ps_cs.c index 894e92ef415b..9f505cf02d96 100644 --- a/drivers/net/ethernet/xircom/xirc2ps_cs.c +++ b/drivers/net/ethernet/xircom/xirc2ps_cs.c @@ -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"); |