linux-kernel - Re: KASAN: use-after-free Read in usb_free

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Date:   Mon, 05 Aug 2019 11:44:47 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>, dtor@...omium.org,
        andreyknvl@...gle.com, syzkaller-bugs@...glegroups.com,
        robh@...nel.org, srinivas.kandagatla@...aro.org,
        gregkh@...uxfoundation.org, mans@...sr.com,
        mathias.payer@...elwelt.net, stern@...land.harvard.edu,
        syzbot+d1fedb1c1fdb07fca507@...kaller.appspotmail.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: KASAN: use-after-free Read in usb_free_coherent

Am Donnerstag, den 01.08.2019, 11:52 +0100 schrieb Suzuki K Poulose:
> 
> Looks like the yurex_delete() drops the ref count on the dev->udev
> way early in the function and then later tries to see if there
> are any other buffers associated with it worth releasing. So,
> I am guessing moving the usb_put_dev(), after we have finished
> all that might solve the issue ?

Hi,

the fix looks good to me.

	Regards
		Oliver