usb: hub: do not clear BOS field during reset device

In function usb_reset_and_verify_device, the old BOS descriptor may
still be used before allocating a new one. (usb_unlocked_disable_lpm
function uses it under the situation that it fails to disable lpm.)
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.

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 <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 51b436918f7892b1249c7ec1b19dad515a9a5755..350dcd9af5d86eb2181e6cc8f77f25a33f712cce 100644 (file)
--- 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) {
 
@@ -5494,8 +5493,11 @@ 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;
 
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