linux-kernel - fotg210-udc: Error in type cast in fotg210_in_fifo

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Date:   Mon, 31 Aug 2020 20:33:09 +0300
From:   lutovinova@...ras.ru
To:     peter.senna@...il.com
Cc:     martin.donnelly@...com, martyn.welch@...labora.co.uk,
        a.hajda@...sung.com, narmstrong@...libre.com,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org, lutovinova@...ras.ru
Subject: fotg210-udc: Error in type cast in fotg210_in_fifo_handler()

If in fotg210_udc_probe() after initialization 
INIT_LIST_HEAD(&ep->queue)
and after a registration of an interrupt handler in fotg210_irq()
fotg210_in_fifo_handler() is calling then in fotg210_in_fifo_handler()
list_entry() tries to get struct fotg210_request from ep->queue.next, 
but
after initialization ep->queue.next is from struct fotg210_udc.

Also this problem appears in  fotg210_out_fifo_handler().

In fotg210_ep0in() and fotg210_ep0out()
there is checking by list_empty() before calling list_entry ().

Found by Linux Driver Verification project (linuxtesting.org).