linux-kernel - [ 021/150] rtlwifi: rtl8192cu: Fix NULL dereference BUG when using new

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Date:	Tue, 26 Feb 2013 15:54:38 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Larry Finger <Larry.Finger@...inger.net>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 021/150] rtlwifi: rtl8192cu: Fix NULL dereference BUG when using new_id

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Larry Finger <Larry.Finger@...inger.net>

commit 957f4aca5fa0db69635271bc4621cc0b65b2d590 upstream.

When the new_id entry in /sysfs is used for a foreign USB device, rtlwifi
BUGS with a NULL pointer dereference because the per-driver configuration
data is not available. The probe function has been restructured as
suggested by Ben Hutchings <bhutchings@...arflare.com>.

Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/rtlwifi/rtl8192cu/sw.c |    8 +++++++-
 drivers/net/wireless/rtlwifi/usb.c          |    5 +++--
 drivers/net/wireless/rtlwifi/usb.h          |    3 ++-
 3 files changed, 12 insertions(+), 4 deletions(-)

--- a/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c
@@ -363,9 +363,15 @@ static struct usb_device_id rtl8192c_usb
 
 MODULE_DEVICE_TABLE(usb, rtl8192c_usb_ids);
 
+static int rtl8192cu_probe(struct usb_interface *intf,
+			   const struct usb_device_id *id)
+{
+	return rtl_usb_probe(intf, id, &rtl92cu_hal_cfg);
+}
+
 static struct usb_driver rtl8192cu_driver = {
 	.name = "rtl8192cu",
-	.probe = rtl_usb_probe,
+	.probe = rtl8192cu_probe,
 	.disconnect = rtl_usb_disconnect,
 	.id_table = rtl8192c_usb_ids,
 
--- a/drivers/net/wireless/rtlwifi/usb.c
+++ b/drivers/net/wireless/rtlwifi/usb.c
@@ -941,7 +941,8 @@ static struct rtl_intf_ops rtl_usb_ops =
 };
 
 int rtl_usb_probe(struct usb_interface *intf,
-			const struct usb_device_id *id)
+		  const struct usb_device_id *id,
+		  struct rtl_hal_cfg *rtl_hal_cfg)
 {
 	int err;
 	struct ieee80211_hw *hw = NULL;
@@ -976,7 +977,7 @@ int rtl_usb_probe(struct usb_interface *
 	usb_set_intfdata(intf, hw);
 	/* init cfg & intf_ops */
 	rtlpriv->rtlhal.interface = INTF_USB;
-	rtlpriv->cfg = (struct rtl_hal_cfg *)(id->driver_info);
+	rtlpriv->cfg = rtl_hal_cfg;
 	rtlpriv->intf_ops = &rtl_usb_ops;
 	rtl_dbgp_flag_init(hw);
 	/* Init IO handler */
--- a/drivers/net/wireless/rtlwifi/usb.h
+++ b/drivers/net/wireless/rtlwifi/usb.h
@@ -157,7 +157,8 @@ struct rtl_usb_priv {
 
 
 int rtl_usb_probe(struct usb_interface *intf,
-			    const struct usb_device_id *id);
+		  const struct usb_device_id *id,
+		  struct rtl_hal_cfg *rtl92cu_hal_cfg);
 void rtl_usb_disconnect(struct usb_interface *intf);
 int rtl_usb_suspend(struct usb_interface *pusb_intf, pm_message_t message);
 int rtl_usb_resume(struct usb_interface *pusb_intf);


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