From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751341AbdISIUM (ORCPT ); Tue, 19 Sep 2017 04:20:12 -0400 Received: from server.atrad.com.au ([150.101.241.2]:39630 "EHLO server.atrad.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750713AbdISIUL (ORCPT ); Tue, 19 Sep 2017 04:20:11 -0400 X-Greylist: delayed 521 seconds by postgrey-1.27 at vger.kernel.org; Tue, 19 Sep 2017 04:20:10 EDT Date: Tue, 19 Sep 2017 17:40:38 +0930 From: Jonathan Woithe To: Jiri Slaby Cc: kernel@kempniu.pl, dvhart@infradead.org, andy@infradead.org, platform-driver-x86@vger.kernel.org, Linux kernel mailing list Subject: Re: NULL pointer dereference in call_fext_func [fujitsu_laptop] Message-ID: <20170919081038.GE10399@marvin.atrad.com.au> References: <541b9a7a-2224-9b81-aef3-3f06491f91e3@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <541b9a7a-2224-9b81-aef3-3f06491f91e3@suse.cz> User-Agent: Mutt/1.6.1 (2016-04-27) X-MIMEDefang-action: accept Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 19, 2017 at 09:56:47AM +0200, Jiri Slaby wrote: > we have this report from 4.13.1: > BUG: unable to handle kernel NULL pointer dereference at 00000004 > IP: call_fext_func.isra.3+0x82/0xf0 [fujitsu_laptop] > *pdpt = 0000000035e79001 *pde = 0000000000000000 > : > It looks like fext is NULL, but bl_update_status passes it down to > call_fext_func which obviously blows up. > > This was originally reported here: > https://bugzilla.suse.com/show_bug.cgi?id=1058814 Thanks for the report. This issue is already being discussed. See the platform drivers thread "[PATCH] platform/x86: fujitsu-laptop: Don't oops when FUJ02E3 is not presnt". > Any ideas? Until the above post to platform drivers it was thought that all Fujitsu laptops had FUJ02E3 since this was what was observed on all models we had access to. An interim patch is under consideration. Regards jonathan