linux-kernel - Problem with f

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Message-ID: <49D62418.6080405@gmail.com>
Date:	Fri, 03 Apr 2009 07:58:32 -0700
From:	"Eugene T. Bordenkircher" <eugebo@...il.com>
To:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Problem with f_rndis.c

The following is an artifact in f_rndis.c that is present because of the USB
gadget refactoring

679         rndis_set_param_medium(rndis->config, NDIS_MEDIUM_802_3, 0);
680         rndis_set_host_mac(rndis->config, rndis->ethaddr);
681
682 #if 0
683 // FIXME
684         if (rndis_set_param_vendor(rndis->config, vendorID,
685                                 manufacturer))
686                 goto fail0;
687 #endif
688
689         /* NOTE:  all that is done without knowing or caring about
690          * the network link ... which is unavailable to this code
691          * until we're activated via set_alt().

The bad news is that I'm hitting an oops because of it.

Newer versions of the windows rndis driver never seem to call
OID_GEN_VENDOR_DESCRIPTION so this isn't a problem.  However, older versions of
XP SP2 and earlier machines still call this, and since the vendor string is
never set in rndis_per_dev_params(rndis.c) the kernel ends up SEGV'ing by
accessing the null pointer for the vendor string.

I played around with this for about 3-4 hours yesterday trying to get the
vendorID and manufacturer in some reasonable manner, but could not find a way
to backtrack to them.

Any suggestions to help me fix it? or even better solutions? :) I have plenty
of boxes that are oops'ing so I can test solutions as needed.

Eugene T. Bordenkircher
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