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usb: gadget: udc-core: fix a regression during gadget driver unbinding

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commit 511f3c5326 upstream.

This patch (as1666) fixes a regression in the UDC core.  The core
takes care of unbinding gadget drivers, and it does the unbinding
before telling the UDC driver to turn off the controller hardware.
When the call to the udc_stop callback is made, the gadget no longer
has a driver.  The callback routine should not be invoked with a
pointer to the old driver; doing so can cause problems (such as
use-after-free accesses in net2280).

This patch should be applied, with appropriate context changes, to all
the stable kernels going back to 3.1.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2013-03-15 14:02:14 -04:00 committed by Greg Kroah-Hartman
parent d50597f63b
commit 39d4978d23
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/udc-core.c
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@ -265,7 +265,7 @@ static void usb_gadget_remove_driver(struct usb_udc *udc)
udc->driver->disconnect(udc->gadget);
usb_gadget_disconnect(udc->gadget);
udc->driver->unbind(udc->gadget);
usb_gadget_udc_stop(udc->gadget, udc->driver);
usb_gadget_udc_stop(udc->gadget, NULL);
} else {
usb_gadget_stop(udc->gadget, udc->driver);
}