usb: xhci: fix uninitialized completion when USB3 port got wrong status

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commit 958c0bd860 upstream.

Realtek USB3.0 Card Reader [0bda:0328] reports wrong port status on
Cannon lake PCH USB3.1 xHCI [8086:a36d] after resume from S3,
after clear port reset it works fine.

Since this device is registered on USB3 roothub at boot,
when port status reports not superspeed, xhci_get_port_status will call
an uninitialized completion in bus_state[0].
Kernel will hang because of NULL pointer.

Restrict the USB2 resume status check in USB2 roothub to fix hang issue.

Cc: stable@vger.kernel.org
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Aaron Ma 2018-11-09 17:21:20 +02:00 • committed by Greg Kroah-Hartman

parent 3e8886bd15

commit 60ac01c60b

2 changed files with 2 additions and 2 deletions

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2

drivers/usb/host/xhci-hub.c

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2

drivers/usb/host/xhci-ring.c

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