linux-kernel - [PATCH 3.14 37/37] Revert "usb: hub: do not clear BOS field during reset device"

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Message-Id: <20160418022402.791648031@linuxfoundation.org>
Date:	Mon, 18 Apr 2016 11:26:09 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tony Battersby <tonyb@...ernetics.com>,
	"Du, Changbin" <changbin.du@...el.com>,
	Roger Quadros <rogerq@...com>
Subject: [PATCH 3.14 37/37] Revert "usb: hub: do not clear BOS field during reset device"

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

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

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

commit e5bdfd50d6f76077bf8441d130c606229e100d40 upstream.

This reverts commit d8f00cd685f5c8e0def8593e520a7fef12c22407.

Tony writes:

This upstream commit is causing an oops:
d8f00cd685f5 ("usb: hub: do not clear BOS field during reset device")

This patch has already been included in several -stable kernels.  Here
are the affected kernels:
4.5.0-rc4 (current git)
4.4.2
4.3.6 (currently in review)
4.1.18
3.18.27
3.14.61

How to reproduce the problem:
Boot kernel with slub debugging enabled (otherwise memory corruption
will cause random oopses later instead of immediately)
Plug in USB 3.0 disk to xhci USB 3.0 port
dd if=/dev/sdc of=/dev/null bs=65536
(where /dev/sdc is the USB 3.0 disk)
Unplug USB cable while dd is still going
Oops is immediate:

Reported-by: Tony Battersby <tonyb@...ernetics.com>
Cc: Du, Changbin <changbin.du@...el.com>
Cc: Roger Quadros <rogerq@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/core/hub.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5231,6 +5231,7 @@ static int usb_reset_and_verify_device(s
 		usb_set_usb2_hardware_lpm(udev, 0);
 
 	bos = udev->bos;
+	udev->bos = NULL;
 
 	/* Disable LPM and LTM while we reset the device and reinstall the alt
 	 * settings.  Device-initiated LPM settings, and system exit latency
@@ -5339,11 +5340,8 @@ done:
 	usb_set_usb2_hardware_lpm(udev, 1);
 	usb_unlocked_enable_lpm(udev);
 	usb_enable_ltm(udev);
-	/* release the new BOS descriptor allocated  by hub_port_init() */
-	if (udev->bos != bos) {
-		usb_release_bos_descriptor(udev);
-		udev->bos = bos;
-	}
+	usb_release_bos_descriptor(udev);
+	udev->bos = bos;
 	return 0;
 
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