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usb: hub: take hub->hdev reference when processing from eventlist

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During surprise device hotplug removal tests, it was observed that
hub_events may try to call usb_lock_device on a device that has already
been freed. Protect the usb_device by taking out a reference (under the
hub_event_lock) when hub_events pulls it off the list, returning the
reference after hub_events is finished using it.

Signed-off-by: Joe Lawrence <[email protected]>
Suggested-by: David Bulkow <[email protected]> for using kref
Suggested-by: Alan Stern <[email protected]> for placement
Acked-by: Alan Stern <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Joe Lawrence 2014-09-10 15:07:50 -04:00 • committed by Greg Kroah-Hartman
commit c605f3cdff
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/core/hub.c
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@ -5024,9 +5024,10 @@ static void hub_events(void)
hub = list_entry(tmp, struct usb_hub, event_list);
kref_get(&hub->kref);
hdev = hub->hdev;
usb_get_dev(hdev);
spin_unlock_irq(&hub_event_lock);
hdev = hub->hdev;
hub_dev = hub->intfdev;
intf = to_usb_interface(hub_dev);
dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
@ -5139,6 +5140,7 @@ static void hub_events(void)
usb_autopm_put_interface(intf);
loop_disconnected:
usb_unlock_device(hdev);
usb_put_dev(hdev);
kref_put(&hub->kref, hub_release);
} /* end while (1) */