Patch "rt2x00usb: fix anchor initialization" has been added to the 4.10-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    rt2x00usb: fix anchor initialization

to the 4.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rt2x00usb-fix-anchor-initialization.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 0488a6121dfe6cbd44de15ea3627913b7549a1e9 Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgruszka@redhat.com>
Date: Wed, 8 Feb 2017 12:18:10 +0100
Subject: rt2x00usb: fix anchor initialization

From: Stanislaw Gruszka <sgruszka@redhat.com>

commit 0488a6121dfe6cbd44de15ea3627913b7549a1e9 upstream.

If device fail to initialize we can OOPS in rt2x00lib_remove_dev(), due
to using uninitialized usb_anchor structure:

[  855.435820] ieee80211 phy3: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1000 with error -19
[  855.435826] ieee80211 phy3: rt2800_probe_rt: Error - Invalid RT chipset 0x0000, rev 0000 detected
[  855.435829] ieee80211 phy3: rt2x00lib_probe_dev: Error - Failed to allocate device
[  855.435845] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
[  855.435900] IP: _raw_spin_lock_irq+0xd/0x30
[  855.435926] PGD 0
[  855.435953] Oops: 0002 [#1] SMP
<snip>
[  855.437011] Call Trace:
[  855.437029]  ? usb_kill_anchored_urbs+0x27/0xc0
[  855.437061]  rt2x00lib_remove_dev+0x190/0x1c0 [rt2x00lib]
[  855.437097]  rt2x00lib_probe_dev+0x246/0x7a0 [rt2x00lib]
[  855.437149]  ? ieee80211_roc_setup+0x9e/0xd0 [mac80211]
[  855.437183]  ? __kmalloc+0x1af/0x1f0
[  855.437207]  ? rt2x00usb_probe+0x13d/0xc50 [rt2x00usb]
[  855.437240]  rt2x00usb_probe+0x155/0xc50 [rt2x00usb]
[  855.437273]  rt2800usb_probe+0x15/0x20 [rt2800usb]
[  855.437304]  usb_probe_interface+0x159/0x2d0
[  855.437333]  driver_probe_device+0x2bb/0x460

Patch changes initialization sequence to fix the problem.

Cc: Vishal Thanki <vishalthanki@gmail.com>
Fixes: 8b4c0009313f ("rt2x00usb: Use usb anchor to manage URB")
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Cc: Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/ralink/rt2x00/rt2x00usb.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
@@ -824,10 +824,6 @@ int rt2x00usb_probe(struct usb_interface
 	if (retval)
 		goto exit_free_device;
 
-	retval = rt2x00lib_probe_dev(rt2x00dev);
-	if (retval)
-		goto exit_free_reg;
-
 	rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev,
 					sizeof(struct usb_anchor),
 					GFP_KERNEL);
@@ -835,10 +831,17 @@ int rt2x00usb_probe(struct usb_interface
 		retval = -ENOMEM;
 		goto exit_free_reg;
 	}
-
 	init_usb_anchor(rt2x00dev->anchor);
+
+	retval = rt2x00lib_probe_dev(rt2x00dev);
+	if (retval)
+		goto exit_free_anchor;
+
 	return 0;
 
+exit_free_anchor:
+	usb_kill_anchored_urbs(rt2x00dev->anchor);
+
 exit_free_reg:
 	rt2x00usb_free_reg(rt2x00dev);
 


Patches currently in stable-queue which might be from sgruszka@redhat.com are

queue-4.10/rt2x00usb-fix-anchor-initialization.patch
queue-4.10/rt2x00usb-do-not-anchor-rx-and-tx-urb-s.patch