diff options
| author | Du, Changbin <changbin.du@intel.com> | 2016-01-18 21:02:42 +0800 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-02-15 15:45:20 -0500 |
| commit | 522dc09ca0451d118795e8a05c7b3717f3d1ad8b (patch) | |
| tree | b61955f7f474b9913ed6686489f7350d0ce91a75 | |
| parent | 08d717c38d856465804b1b1d3fea19b64d8214e7 (diff) | |
usb: hub: do not clear BOS field during reset device
[ Upstream commit d8f00cd685f5c8e0def8593e520a7fef12c22407 ]
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 <changbin.du@intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/usb/core/hub.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index ee11b301f3da..e56ad83b35a4 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -5346,7 +5346,6 @@ 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) { @@ -5439,8 +5438,11 @@ 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; re_enumerate: |