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Date: Tue, 17 May 2016 15:16:44 -0700
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Cc: Alan Stern <stern@rowland.harvard.edu>, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org
Subject: Re: UBSAN whinge in ihci-hub.c
Message-ID: <20160517221644.GA17167@kroah.com>
References: <5739.1463521960@turing-police.cc.vt.edu>
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On Tue, May 17, 2016 at 05:52:40PM -0400, Valdis Kletnieks wrote:
> So, not content in the amount of breakage I generate already, I
> compiled with UBSAN enabled...
> 
> The immediately relevant part:
> 
> [    2.418576] ================================================================================
> [    2.418579] UBSAN: Undefined behaviour in drivers/usb/host/ehci-hub.c:877:47
> [    2.418582] index -1 is out of range for type 'u32 [1]'

<snip>

It's a known bug in ubsan, please see the linux-usb archives for the
details :(