From patchwork Thu Sep 2 05:52:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryder Lee X-Patchwork-Id: 506925 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, USER_AGENT_GIT 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 65DBAC432BE for ; Thu, 2 Sep 2021 05:52:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D2F960238 for ; Thu, 2 Sep 2021 05:52:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233233AbhIBFxn (ORCPT ); Thu, 2 Sep 2021 01:53:43 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:47678 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S231831AbhIBFxm (ORCPT ); Thu, 2 Sep 2021 01:53:42 -0400 X-UUID: 829f045f5a7c4f3a9089fb1c2a6bf45d-20210902 X-UUID: 829f045f5a7c4f3a9089fb1c2a6bf45d-20210902 Received: from mtkcas07.mediatek.inc [(172.21.101.84)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 309807063; Thu, 02 Sep 2021 13:52:42 +0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs05n1.mediatek.inc (172.21.101.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 2 Sep 2021 13:52:40 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 2 Sep 2021 13:52:40 +0800 From: Ryder Lee To: Felix Fietkau CC: Lorenzo Bianconi , Shayne Chen , Evelyn Tsai , , , Ben Greear , Ryder Lee Subject: [PATCH v6 1/2] mt76: mt7915: fix hwmon temp sensor mem use-after-free Date: Thu, 2 Sep 2021 13:52:03 +0800 Message-ID: <101c24cfc81ed5819d93c60cf2e96bdd6ce97c47.1630561295.git.ryder.lee@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Ben Greear Without this change, garbage is seen in the hwmon name and sensors output for mt7915 is garbled. It appears that the hwmon logic does not make a copy of the incoming string, but instead just copies a char* and expects it to never go away. Fixes: d6938251bb5b ("mt76: mt7915: add thermal sensor device support") Signed-off-by: Ben Greear Signed-off-by: Ryder Lee --- v6: Use devm_kasprintf to add a generic prefix "mt7915-" on wiphy name. Drop an unrelated change. v5: Use devm_kstrdup on the wiphy name as suggested. v4: Simplify flow. v3: Add 'fixes' tag to aid backports. --- drivers/net/wireless/mediatek/mt76/mt7915/init.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c index acc83e9f409b..f43e4077489b 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c @@ -160,9 +160,12 @@ static int mt7915_thermal_init(struct mt7915_phy *phy) struct wiphy *wiphy = phy->mt76->hw->wiphy; struct thermal_cooling_device *cdev; struct device *hwmon; + const char *name; - cdev = thermal_cooling_device_register(wiphy_name(wiphy), phy, - &mt7915_thermal_ops); + name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7915-%s", + wiphy_name(wiphy)); + + cdev = thermal_cooling_device_register(name, phy, &mt7915_thermal_ops); if (!IS_ERR(cdev)) { if (sysfs_create_link(&wiphy->dev.kobj, &cdev->device.kobj, "cooling_device") < 0) @@ -174,8 +177,7 @@ static int mt7915_thermal_init(struct mt7915_phy *phy) if (!IS_REACHABLE(CONFIG_HWMON)) return 0; - hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, - wiphy_name(wiphy), phy, + hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, phy, mt7915_hwmon_groups); if (IS_ERR(hwmon)) return PTR_ERR(hwmon);