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

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Date:   Fri, 9 Aug 2019 16:52:06 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     syzbot <syzbot+22ae4e3b9fcc8a5c153a@...kaller.appspotmail.com>
cc:     andreyknvl@...gle.com, <gregkh@...uxfoundation.org>,
        <gustavo@...eddedor.com>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-free Read in usb_kill_urb

On Fri, 9 Aug 2019, syzbot wrote:

> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger  
> crash:
> 
> Reported-and-tested-by:  
> syzbot+22ae4e3b9fcc8a5c153a@...kaller.appspotmail.com
> 
> Tested on:
> 
> commit:         e96407b4 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=173f2d2c600000
> 
> Note: testing is done by a robot and is best-effort only.

This shows that this bug is a duplicate of extid=30cf45ebfe0b0c4847a1.  
This fact is also visible in the console logs; both have lines saying 
something like:

[  549.416341][   T22] sysfs: cannot create duplicate filename '/class/usbmisc/ldusb0'

and

[  549.958755][   T22] ldusb 1-1:0.28: Not able to get a minor for this device.

preceding the invalid access.

Alan Stern