[PATCH] rtlwifi: rtl8192cu: Fix NULL dereference BUG when using new_id

[Larry Finger <Larry.Finger@lwfinger.net>]

When the new_id entry is used for a foreign USB device, rtlwifi BUGS with
a NULL pointer dereference.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
---

John,

Although this patch should be backported to stable kernels, the new_id
feature is rarely used, thus the patch should not have any particular
priority.

Larry
---

 drivers/net/wireless/rtlwifi/usb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/rtlwifi/usb.c b/drivers/net/wireless/rtlwifi/usb.c
index d42bbe2..77a7517 100644
--- a/drivers/net/wireless/rtlwifi/usb.c
+++ b/drivers/net/wireless/rtlwifi/usb.c
@@ -977,6 +977,9 @@ int rtl_usb_probe(struct usb_interface *intf,
 	rtl_dbgp_flag_init(hw);
 	/* Init IO handler */
 	_rtl_usb_io_handler_init(&udev->dev, hw);
+	if (!rtlpriv->cfg || !rtlpriv->cfg->ops ||
+	    !rtlpriv->cfg->ops->read_chip_version)
+		return -ENODEV;
 	rtlpriv->cfg->ops->read_chip_version(hw);
 	/*like read eeprom and so on */
 	rtlpriv->cfg->ops->read_eeprom_info(hw);
-- 
1.8.1