linux-kernel - Re: ftdi_sio BUG: NULL pointer dereference

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Date:	Mon, 02 Jun 2014 12:09:36 -0400
From:	Mike Remski <mremski@...ualink.net>
To:	Johan Hovold <jhovold@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: ftdi_sio BUG: NULL pointer dereference

On 06/02/2014 11:40 AM, Johan Hovold wrote:
> [ Please avoid top-posting. ]
>
> On Mon, Jun 02, 2014 at 11:16:11AM -0400, Mike Remski wrote:
>> Thanks Johan, that's why I looked at the cross references for ftdi_sio.c
>> over on
>> http://lxr.free-electrons.com/source/drivers/usb/serial/ftdi_sio.c,
>> latest version it's showing is 3.14.  It appears that the ftdi_sio code
>> is largely the same as in 2.6.32, particularly in the
>> ftdi_set_max_packet_size() function.
> Lots of things have changed since v2.6.32 and not just in the driver
> itself but in all the infrastructure it relies on.
>
>> I'm trying to verify if the "number of endpoints is 0" is a valid
>> situation.
> No, that is not normal, but it should not crash the driver if it's a
> hardware issue. What is the lsusb -v output of your device (make sure
> the ftdi_sio driver isn't loaded when connecting the device).
>
> And what happens if you plug it into a machine running a recent kernel?
>
> Thanks,
> Johan
Plugging device into a system running Redhat, kernel 3.3.4 crashes the 
system.

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