From patchwork Wed Sep 1 17:49:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryder Lee X-Patchwork-Id: 505446 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, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 182D0C4320A for ; Wed, 1 Sep 2021 17:50:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0275D610A4 for ; Wed, 1 Sep 2021 17:50:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346892AbhIARvk (ORCPT ); Wed, 1 Sep 2021 13:51:40 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:32860 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1347258AbhIARug (ORCPT ); Wed, 1 Sep 2021 13:50:36 -0400 X-UUID: db52d65430c5401e86b7bf2f08cbfdbd-20210902 X-UUID: db52d65430c5401e86b7bf2f08cbfdbd-20210902 Received: from mtkcas06.mediatek.inc [(172.21.101.30)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 218883630; Thu, 02 Sep 2021 01:49:35 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs05n1.mediatek.inc (172.21.101.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 2 Sep 2021 01:49:34 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 2 Sep 2021 01:49:34 +0800 From: Ryder Lee To: Felix Fietkau CC: Lorenzo Bianconi , Shayne Chen , Evelyn Tsai , , , Ben Greear , Ryder Lee Subject: [PATCH v5 1/2] mt76: mt7915: fix hwmon temp sensor mem use-after-free Date: Thu, 2 Sep 2021 01:49:30 +0800 Message-ID: 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 --- 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 | 8 ++++---- drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c index acc83e9f409b..78b9abbe63f3 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c @@ -160,9 +160,10 @@ 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_kstrdup(&wiphy->dev, wiphy_name(wiphy), GFP_KERNEL); + 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 +175,7 @@ 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); diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c index 932cf5a629db..219bb353b56d 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c @@ -1962,7 +1962,7 @@ mt7915_mcu_sta_bfer_tlv(struct mt7915_dev *dev, struct sk_buff *skb, else return; - bf->bf_cap = BIT(!ebf && dev->ibf); + bf->bf_cap = ebf ? ebf : dev->ibf << 1; bf->bw = sta->bandwidth; bf->ibf_dbw = sta->bandwidth; bf->ibf_nrow = tx_ant;