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[PATCH] hostap: Do not free local->hw_priv before unregistering netdev

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local->hw_priv was being freed and set to NULL just before calling
prism2_free_local_data(). However, this may expose a race condition in
which something ends up trying to use hw_priv during shutdown. I
haven't noticed this happening, but better be safe than sorry, so
let's postpone hw_priv freeing to happen only after
prism2_free_local_data() has returned.

Signed-off-by: Jouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Jouni Malinen 2005-10-02 17:19:00 -07:00 • committed by Jeff Garzik
commit c355184cd3
3 changed files with 7 additions and 14 deletions
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7
drivers/net/wireless/hostap/hostap_plx.c
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@ -568,10 +568,8 @@ static int prism2_plx_probe(struct pci_dev *pdev,
return hostap_hw_ready(dev);
fail:
kfree(hw_priv);
if (local)
local->hw_priv = NULL;
prism2_free_local_data(dev);
kfree(hw_priv);
if (irq_registered && dev)
free_irq(dev->irq, dev);
@ -604,9 +602,8 @@ static void prism2_plx_remove(struct pci_dev *pdev)
if (dev->irq)
free_irq(dev->irq, dev);
kfree(iface->local->hw_priv);
iface->local->hw_priv = NULL;
prism2_free_local_data(dev);
kfree(hw_priv);
pci_disable_device(pdev);
}