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

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
parent f7a7444755
commit c355184cd3
3 changed files with 7 additions and 14 deletions
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5
drivers/net/wireless/hostap/hostap_cs.c
View File

@ -565,13 +565,14 @@ static void prism2_detach(dev_link_t *link)
*linkp = link->next;
/* release net devices */
if (link->priv) {
struct hostap_cs_priv *hw_priv;
struct net_device *dev;
struct hostap_interface *iface;
dev = link->priv;
iface = netdev_priv(dev);
kfree(iface->local->hw_priv);
iface->local->hw_priv = NULL;
hw_priv = iface->local->hw_priv;
prism2_free_local_data(dev);
kfree(hw_priv);
}
kfree(link);
}

9
drivers/net/wireless/hostap/hostap_pci.c
View File

@ -358,8 +358,6 @@ static int prism2_pci_probe(struct pci_dev *pdev,
return hostap_hw_ready(dev);
fail:
kfree(hw_priv);
if (irq_registered && dev)
free_irq(dev->irq, dev);
@ -370,10 +368,8 @@ static int prism2_pci_probe(struct pci_dev *pdev,
err_out_disable:
pci_disable_device(pdev);
kfree(hw_priv);
if (local)
local->hw_priv = NULL;
prism2_free_local_data(dev);
kfree(hw_priv);
return -ENODEV;
}
@ -398,9 +394,8 @@ static void prism2_pci_remove(struct pci_dev *pdev)
free_irq(dev->irq, dev);
mem_start = hw_priv->mem_start;
kfree(hw_priv);
iface->local->hw_priv = NULL;
prism2_free_local_data(dev);
kfree(hw_priv);
iounmap(mem_start);

7
drivers/net/wireless/hostap/hostap_plx.c
View File

@ -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);
}