linux-kernel - Re: [PATCH] udc: Memory leak on error path and use after free

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Message-ID: <Pine.LNX.4.44L0.1708161125520.3053-100000@iolanthe.rowland.org>
Date:   Wed, 16 Aug 2017 11:29:06 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Anton Vasilyev <vasilyev@...ras.ru>
cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jussi Kivilinna <jussi.kivilinna@...tian.com>,
        Peter Senna Tschudin <peter.senna@...labora.com>,
        Raz Manor <Raz.Manor@...ens.com>,
        Romain Perier <romain.perier@...labora.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ldv-project@...uxtesting.org>
Subject: Re: [PATCH] udc: Memory leak on error path and use after free

On Wed, 16 Aug 2017, Anton Vasilyev wrote:

> gadget_release() is responsible for cleanup dev memory.
> But if net2280_probe() fails after dev allocation, then
> gadget_release() become unregistered and dev memory leaks.

This isn't needed if usb_add_gadget_udc_release() is fixed, right?

> Also net2280_remove() calls usb_del_gadget_udc() which
> perform schedule_delayed_work() with gadget_release(), so
> it is possible that dev will be deallocated exactly after
> this call and leads to use after free.

Where is there a possible use after free?

> The patch moves deallocation from gadget_release() to
> net2280_remove().

Alan Stern