linux-kernel - Re: KASAN: slab-out-of-bounds Read in vhci_hub

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Message-ID: <62457d9f-0732-3886-0381-bbf5df738467@kernel.org>
Date:   Tue, 2 Oct 2018 10:04:57 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     syzbot <syzbot+bccc1fe10b70fadc78d0@...kaller.appspotmail.com>,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        valentina.manea.m@...il.com
Cc:     Shuah Khan <shuah@...nel.org>
Subject: Re: KASAN: slab-out-of-bounds Read in vhci_hub_control

On 09/04/2018 12:52 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    420f51f4ab6b Merge tag 'arm64-fixes' of git://git.kernel.o..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=126a6f0e400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=531a917630d2a492
> dashboard link: https://syzkaller.appspot.com/bug?extid=bccc1fe10b70fadc78d0
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=121caa46400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14ed8ab6400000

C producer doesn't reproduce the problem on 4.19-rc5. Does this C producer
depend on state of the machine? i.e what is the status of vhci_hcd - are
there any devices attached?

I can see the problem looking at the code and fix is easy. However, I would
like be able to reproduce it and verify the fix works. Also this would be a
good regression for the driver I could consider adding to selftests.

thanks,
-- Shuah