[PATCH] usb: hub: fix panic caused by NULL bos pointer during reset device

[changbin . du]

From: "Du, Changbin" <changbin.du@xxxxxxxxx>

This is a reworked patch based on reverted commit d8f00cd685f5 ("usb:
hub: do not clear BOS field during reset device").

The privious one caused double mem-free if run to re_enumerate label.
New patch title changed to distinguish from old one. And I have tested
it with memory debugging options.

In function usb_reset_and_verify_device, the old BOS descriptor may
still be used before allocating a new one. (usb_disable_lpm function
uses it under the situation that it fails at usb_disable_link_state.)
So we cannot set the udev->bos to NULL before that, just keep what it
was. It will be overwrite when allocating a new one.

How to reproduce:
1. connect one usb3 hub to xhci port.
2. connect several lpm-capable super-speed usb disk to the hub.
3. copy big files to the usb disks.
4. disconnect the hub and repeat step 1-4.

Crash log:
BUG: unable to handle kernel NULL pointer dereference at
0000000000000010
IP: [<ffffffff8171f98d>] usb_enable_link_state+0x2d/0x2f0
Call Trace:
[<ffffffff8171ed5b>] ? usb_set_lpm_timeout+0x12b/0x140
[<ffffffff8171fcd1>] usb_enable_lpm+0x81/0xa0
[<ffffffff8171fdd8>] usb_disable_lpm+0xa8/0xc0
[<ffffffff8171fe1c>] usb_unlocked_disable_lpm+0x2c/0x50
[<ffffffff81723933>] usb_reset_and_verify_device+0xc3/0x710
[<ffffffff8172c4ed>] ? usb_sg_wait+0x13d/0x190
[<ffffffff81724743>] usb_reset_device+0x133/0x280
[<ffffffff8179ccd1>] usb_stor_port_reset+0x61/0x70
[<ffffffff8179cd68>] usb_stor_invoke_transport+0x88/0x520

Signed-off-by: Du, Changbin <changbin.du@xxxxxxxxx>
---
 drivers/usb/core/hub.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 51b43691..27444e5 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5401,7 +5401,6 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
 	}
 
 	bos = udev->bos;
-	udev->bos = NULL;
 
 	for (i = 0; i < SET_CONFIG_TRIES; ++i) {
 
@@ -5494,13 +5493,18 @@ done:
 	usb_set_usb2_hardware_lpm(udev, 1);
 	usb_unlocked_enable_lpm(udev);
 	usb_enable_ltm(udev);
-	usb_release_bos_descriptor(udev);
-	udev->bos = bos;
+	/* release the new BOS descriptor allocated by hub_port_init() */
+	if (udev->bos != bos) {
+		usb_release_bos_descriptor(udev);
+		udev->bos = bos;
+	}
 	return 0;
 
 re_enumerate:
-	usb_release_bos_descriptor(udev);
-	udev->bos = bos;
+	if (udev->bos != bos) {
+		usb_release_bos_descriptor(udev);
+		udev->bos = bos;
+	}
 re_enumerate_no_bos:
 	/* LPM state doesn't matter when we're about to destroy the device. */
 	hub_port_logical_disconnect(parent_hub, port1);
-- 
2.5.0