From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10ABEC11D0C for ; Thu, 20 Feb 2020 20:16:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B28D220722 for ; Thu, 20 Feb 2020 20:16:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=treblig.org header.i=@treblig.org header.b="qguH4Oac" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728770AbgBTUQp (ORCPT ); Thu, 20 Feb 2020 15:16:45 -0500 Received: from mx.treblig.org ([46.43.15.161]:59592 "EHLO mx.treblig.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728556AbgBTUQp (ORCPT ); Thu, 20 Feb 2020 15:16:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=treblig.org ; s=bytemarkmx; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID :Subject:Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID :Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To: Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe :List-Post:List-Owner:List-Archive; bh=RBFWvcNK9HUxppE9HG/jot3VGugSlFz9u8NZkx19rDA=; b=qguH4OacqV06m57cdS2mGaGQWB W4Z8af89tra2rxWGlmCp6UhXqZCH/TEg+eYNHqLao0nrTm0o8PBIhAAl04lzfYbagAtve3LKgq0ct bxjUQKMzwdCc3bYZKuNUH2u2oKJLVIKT4wzaBdkza29KA6zlcJiwrOIANowel1htlTfqekgHr49bw pCwv4gFArts4bN82CuevjKYZ7qMlCpfGD5p2XszeOvvsVhJtHsNhnAeMhmWQDIFV1iyis+eQ8fTTy 5lbhqYYxoGjRQFIDUoaCX5pL4N9nzT3cbxQltZJ7MgpI5aNoGT3F/huJbLRUmj+wuhxE9Xi1Ge8k6 4ZVVX6xw==; Received: from dg by mx.treblig.org with local (Exim 4.92) (envelope-from ) id 1j4sFW-0002QA-3M; Thu, 20 Feb 2020 20:16:42 +0000 Date: Thu, 20 Feb 2020 20:16:42 +0000 From: "Dr. David Alan Gilbert" To: Guenter Roeck Cc: Hardware Monitoring , Jean Delvare , Meelis Roos Subject: Re: [PATCH] hwmon: (w83627ehf) Fix crash seen with W83627DHG-P Message-ID: <20200220201642.GD18071@gallifrey> References: <20200220143744.10278-1-linux@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200220143744.10278-1-linux@roeck-us.net> X-Chocolate: 70 percent or better cocoa solids preferably X-Operating-System: Linux/4.19.0-5-amd64 (x86_64) X-Uptime: 20:15:44 up 172 days, 20:36, 1 user, load average: 0.12, 0.05, 0.01 User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org * Guenter Roeck (linux@roeck-us.net) wrote: > Loading the driver on a system with W83627DHG-P crashes as follows. > > w83627ehf: Found W83627DHG-P chip at 0x290 > BUG: kernel NULL pointer dereference, address: 0000000000000000 > PGD 0 P4D 0 > Oops: 0000 [#1] SMP NOPTI > CPU: 0 PID: 604 Comm: sensors Not tainted 5.6.0-rc2-00055-gca7e1fd1026c #29 > Hardware name: /D425KT, BIOS MWPNT10N.86A.0132.2013.0726.1534 07/26/2013 > RIP: 0010:w83627ehf_read_string+0x27/0x70 [w83627ehf] > Code: [... ] > RSP: 0018:ffffb95980657df8 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff96caaa7f5218 RCX: 0000000000000000 > RDX: 0000000000000015 RSI: 0000000000000001 RDI: ffff96caa736ec08 > RBP: 0000000000000000 R08: ffffb95980657e20 R09: 0000000000000001 > R10: ffff96caaa635cc0 R11: 0000000000000000 R12: ffff96caa9f7cf00 > R13: ffff96caa9ec3d00 R14: ffff96caa9ec3d28 R15: ffff96caa9ec3d40 > FS: 00007fbc7c4e2740(0000) GS:ffff96caabc00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 0000000129d58000 CR4: 00000000000006f0 > Call Trace: > ? cp_new_stat+0x12d/0x160 > hwmon_attr_show_string+0x37/0x70 [hwmon] > dev_attr_show+0x14/0x50 > sysfs_kf_seq_show+0xb5/0x1b0 > seq_read+0xcf/0x460 > vfs_read+0x9b/0x150 > ksys_read+0x5f/0xe0 > do_syscall_64+0x48/0x190 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > ... > > Temperature labels are not always present. Adjust sysfs attribute > visibility accordingly. > > Reported-by: Meelis Roos > Cc: Meelis Roos > Cc: Dr. David Alan Gilbert > Fixes: 266cd5835947 ("hwmon: (w83627ehf) convert to with_info interface") > Signed-off-by: Guenter Roeck Signed-off-by: Dr. David Alan Gilbert > --- > drivers/hwmon/w83627ehf.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c > index 7ffadc2da57b..5a5120121e50 100644 > --- a/drivers/hwmon/w83627ehf.c > +++ b/drivers/hwmon/w83627ehf.c > @@ -1346,8 +1346,13 @@ w83627ehf_is_visible(const void *drvdata, enum hwmon_sensor_types type, > /* channel 0.., name 1.. */ > if (!(data->have_temp & (1 << channel))) > return 0; > - if (attr == hwmon_temp_input || attr == hwmon_temp_label) > + if (attr == hwmon_temp_input) > return 0444; > + if (attr == hwmon_temp_label) { > + if (data->temp_label) > + return 0444; > + return 0; > + } > if (channel == 2 && data->temp3_val_only) > return 0; > if (attr == hwmon_temp_max) { > -- > 2.17.1 > -- -----Open up your eyes, open up your mind, open up your code ------- / Dr. David Alan Gilbert | Running GNU/Linux | Happy \ \ dave @ treblig.org | | In Hex / \ _________________________|_____ http://www.treblig.org |_______/