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

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Date:	Mon, 2 Jun 2014 09:23:46 -0700
From:	Greg KH <greg@...ah.com>
To:	Mike Remski <mremski@...ualink.net>
Cc:	Johan Hovold <jhovold@...il.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: ftdi_sio BUG: NULL pointer dereference

On Mon, Jun 02, 2014 at 12:09:36PM -0400, Mike Remski wrote:
> 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.

3.3.4 is still _many_ years old.  Please try something from 2014 at the
latest...
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