linux-kernel - [PATCH 1/2] staging: rtl8712: Fix oops on dongle removal if firmware is not available

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Sun,  1 Jun 2014 14:34:39 +0200
From:	Thomas Vegas <thomas@...uk.net>
To:	gregkh@...uxfoundation.org
Cc:	Larry.Finger@...inger.net, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, Thomas Vegas <thomas@...uk.net>
Subject: [PATCH 1/2] staging: rtl8712: Fix oops on dongle removal if firmware is not available

When firmware is not available, net device is not created. Upon
disconnect, we must check for net device existence before trying to
release net device private data.

Signed-off-by: Thomas Vegas <thomas@...uk.net>
---
 drivers/staging/rtl8712/usb_intf.c | 44 +++++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
index ba74354..bec9d454 100644
--- a/drivers/staging/rtl8712/usb_intf.c
+++ b/drivers/staging/rtl8712/usb_intf.c
@@ -607,31 +607,31 @@ error:
 static void r871xu_dev_remove(struct usb_interface *pusb_intf)
 {
 	struct net_device *pnetdev = usb_get_intfdata(pusb_intf);
-	struct _adapter *padapter = netdev_priv(pnetdev);
 	struct usb_device *udev = interface_to_usbdev(pusb_intf);
 
-	usb_set_intfdata(pusb_intf, NULL);
-	if (padapter->fw_found)
-		release_firmware(padapter->fw);
-	/* never exit with a firmware callback pending */
-	wait_for_completion(&padapter->rtl8712_fw_ready);
-	if (drvpriv.drv_registered == true)
-		padapter->bSurpriseRemoved = true;
-	if (pnetdev != NULL) {
-		/* will call netdev_close() */
-		unregister_netdev(pnetdev);
+	if (pnetdev) {
+		struct _adapter *padapter = netdev_priv(pnetdev);
+
+		usb_set_intfdata(pusb_intf, NULL);
+		if (padapter->fw_found)
+			release_firmware(padapter->fw);
+		/* never exit with a firmware callback pending */
+		wait_for_completion(&padapter->rtl8712_fw_ready);
+		if (drvpriv.drv_registered == true)
+			padapter->bSurpriseRemoved = true;
+		unregister_netdev(pnetdev); /* will call netdev_close() */
+		flush_scheduled_work();
+		udelay(1);
+		/* Stop driver mlme relation timer */
+		if (padapter->fw_found)
+			r8712_stop_drv_timers(padapter);
+		r871x_dev_unload(padapter);
+		r8712_free_drv_sw(padapter);
+
+		/* decrease the reference count of the usb device structure
+		 * when disconnect */
+		usb_put_dev(udev);
 	}
-	flush_scheduled_work();
-	udelay(1);
-	/*Stop driver mlme relation timer */
-	if (padapter->fw_found)
-		r8712_stop_drv_timers(padapter);
-	r871x_dev_unload(padapter);
-	r8712_free_drv_sw(padapter);
-	usb_set_intfdata(pusb_intf, NULL);
-	/* decrease the reference count of the usb device structure
-	 * when disconnect */
-	usb_put_dev(udev);
 	/* If we didn't unplug usb dongle and remove/insert module, driver
 	 * fails on sitesurvey for the first time when device is up.
 	 * Reset usb port for sitesurvey fail issue. */
-- 
1.8.5.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/