From patchwork Mon Dec 5 19:09:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 13065016 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F4E0C4332F for ; Mon, 5 Dec 2022 19:22:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230381AbiLETWb (ORCPT ); Mon, 5 Dec 2022 14:22:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46558 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233504AbiLETVv (ORCPT ); Mon, 5 Dec 2022 14:21:51 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9565164D7; Mon, 5 Dec 2022 11:17:47 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 59F96B81201; Mon, 5 Dec 2022 19:16:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A95FCC433C1; Mon, 5 Dec 2022 19:16:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670267799; bh=7uVZopgE1e0SapTb5i26gNiN1i0iX2gcULH+t0ZU+pQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=euAc01JOlvy3X0Zg+B1jq5NvaaIGta4prC58gf5Zg1fNbGNgy11XNeXaEvEODyiRj UHH9bVr1KXaUu2oHOzbiT5GL019zzJ5dCf2OAzzw9AP6I9nf0F1qvGdlmZpheFcBGH vvn/vMR8m5duhT9dFUex+jjC66/7BZAReVn8uXsw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Phil Auld , linux-hwmon@vger.kernel.org, Fenghua Yu , Jean Delvare , Guenter Roeck , Sasha Levin Subject: [PATCH 4.14 56/77] hwmon: (coretemp) Check for null before removing sysfs attrs Date: Mon, 5 Dec 2022 20:09:47 +0100 Message-Id: <20221205190802.850592627@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205190800.868551051@linuxfoundation.org> References: <20221205190800.868551051@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Phil Auld [ Upstream commit a89ff5f5cc64b9fe7a992cf56988fd36f56ca82a ] If coretemp_add_core() gets an error then pdata->core_data[indx] is already NULL and has been kfreed. Don't pass that to sysfs_remove_group() as that will crash in sysfs_remove_group(). [Shortened for readability] [91854.020159] sysfs: cannot create duplicate filename '/devices/platform/coretemp.0/hwmon/hwmon2/temp20_label' [91855.126115] BUG: kernel NULL pointer dereference, address: 0000000000000188 [91855.165103] #PF: supervisor read access in kernel mode [91855.194506] #PF: error_code(0x0000) - not-present page [91855.224445] PGD 0 P4D 0 [91855.238508] Oops: 0000 [#1] PREEMPT SMP PTI ... [91855.342716] RIP: 0010:sysfs_remove_group+0xc/0x80 ... [91855.796571] Call Trace: [91855.810524] coretemp_cpu_offline+0x12b/0x1dd [coretemp] [91855.841738] ? coretemp_cpu_online+0x180/0x180 [coretemp] [91855.871107] cpuhp_invoke_callback+0x105/0x4b0 [91855.893432] cpuhp_thread_fun+0x8e/0x150 ... Fix this by checking for NULL first. Signed-off-by: Phil Auld Cc: linux-hwmon@vger.kernel.org Cc: Fenghua Yu Cc: Jean Delvare Cc: Guenter Roeck Link: https://lore.kernel.org/r/20221117162313.3164803-1-pauld@redhat.com Fixes: 199e0de7f5df3 ("hwmon: (coretemp) Merge pkgtemp with coretemp") Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/coretemp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index a42744c7665b..ee35bbc1714a 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -531,6 +531,10 @@ static void coretemp_remove_core(struct platform_data *pdata, int indx) { struct temp_data *tdata = pdata->core_data[indx]; + /* if we errored on add then this is already gone */ + if (!tdata) + return; + /* Remove the sysfs attributes */ sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);