[PATCH] hostap: Fix null pointer dereference in prism2_pccard_card_pr…

…esent()

local->hw_priv was initialized only after the interrupt handler was
registered. This could trigger a NULL pointer dereference in
prism2_pccard_card_present() that assumed that local->hw_priv is always
set (and it should have been). Fix this by setting local->hw_priv before
registering the interrupt handler.

Signed-off-by: Jouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/wireless/hostap/hostap_cs.c

@@ -772,6 +772,13 @@ static int prism2_config(dev_link_t *link)
 		goto failed;
 	link->priv = dev;
 
+	iface = netdev_priv(dev);
+	local = iface->local;
+	local->hw_priv = hw_priv;
+	hw_priv->link = link;
+	strcpy(hw_priv->node.dev_name, dev->name);
+	link->dev = &hw_priv->node;
+
 	/*
 	 * Allocate an interrupt line.  Note that this does not assign a
 	 * handler to the interrupt, unless the 'Handler' member of the
@@ -817,13 +824,6 @@ static int prism2_config(dev_link_t *link)
 	link->state |= DEV_CONFIG;
 	link->state &= ~DEV_CONFIG_PENDING;
 
-	iface = netdev_priv(dev);
-	local = iface->local;
-	local->hw_priv = hw_priv;
-	hw_priv->link = link;
-	strcpy(hw_priv->node.dev_name, dev->name);
-	link->dev = &hw_priv->node;
-
 	local->shutdown = 0;
 
 	sandisk_enable_wireless(dev);