From nobody Mon Feb 9 02:24:36 2026 Received: from azure-sdnproxy.icoremail.net (azure-sdnproxy.icoremail.net [13.76.78.106]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 84CC041C62; Fri, 30 Jan 2026 14:58:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.76.78.106 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769785140; cv=none; b=lAzFZ/n9vrU5bxWoLCaYMFq1Uq7QXwb9wxai2OjqgXpXfA5x8fECJzxMFqvT+JSw6ku3TWR0i7QADddWt9bLa5P+in69j1m2Qh6fQtIrDzy1moNRjjuLx/MFju7A48ZN/nDudSdgpovUTuqfDrUl1mUZ+WUFMGD1OHCELjdZStk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769785140; c=relaxed/simple; bh=QtzEdA9ntSNO7ppt6lzTmGwmBNOVWqhYXfkYsqeaHB4=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=d1rO51UTy8SZN8u3RTK+7w+WR3ppowgyE3Gbc5GjlSahfP0WawldLt/JnGu3i3/o7ArKNfCBMxemP3C3BlHfNd1+DdxcLgY1OumC50llSpwhjVhQfcGa/Sa6dVP3XCphTAZZf2L3+jFAcJDYjTgf5VAi+gcBHWU3mCTXQ8X0EZQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=zju.edu.cn; spf=pass smtp.mailfrom=zju.edu.cn; arc=none smtp.client-ip=13.76.78.106 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=zju.edu.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zju.edu.cn Received: from zju.edu.cn (unknown [106.117.99.170]) by mtasvr (Coremail) with SMTP id _____wBnPM78xnxp8L1gAA--.5479S3; Fri, 30 Jan 2026 22:58:05 +0800 (CST) Received: from ubuntu.localdomain (unknown [106.117.99.170]) by mail-app1 (Coremail) with SMTP id yy_KCgDH0dv5xnxpnhTxBQ--.54572S2; Fri, 30 Jan 2026 22:58:03 +0800 (CST) From: Duoming Zhou To: linux-wireless@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, nbd@nbd.name, lorenzo@kernel.org, ryder.lee@mediatek.com, shayne.chen@mediatek.com, sean.wang@mediatek.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, kuba@kernel.org, alexander.deucher@amd.com, pkshih@realtek.com, akpm@linux-foundation.org, StanleyYP.Wang@mediatek.com, howard-yh.hsu@mediatek.com, rosenp@gmail.com, Duoming Zhou Subject: [PATCH] wifi: mt76: mt7915: fix use-after-free bugs in mt7915_mac_dump_work() Date: Fri, 30 Jan 2026 22:57:59 +0800 Message-Id: <20260130145759.84272-1-duoming@zju.edu.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: yy_KCgDH0dv5xnxpnhTxBQ--.54572S2 X-CM-SenderInfo: qssqjiasttq6lmxovvfxof0/1tbiAwYHAWl7uAYDcwBHsY X-CM-DELIVERINFO: =?B?cYGOmAXKKxbFmtjJiESix3B1w3uoVhYI+vyen2ZzBEkOnu5chDpkB+ZdGnv/zQ0PbP CR11YjdbuMySUouUtrOXK8iwzYcuYFk7aHTFsYiRbb0uC/oQbxyu3xRrnSKM/xJF44wcM8 Hq9+lQsvkMLsMeqhmXkB8lQQRIwc0TJdq+owcnJ2UFiSBZHsqxAN1s176MXBxg== X-Coremail-Antispam: 1Uk129KBj93XoW7Zr1xKr15CFykKFyxXFy8tFc_yoW8WFWkpa yFga4UurWUWFsrt3yDJFWxJa15W3Zag34jkryrW34Yq395GFySyws8ZFy29Fy0yF4qkFyY vr45tr98uFyYvFXCm3ZEXasCq-sJn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUU9Eb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AK xVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI0UMc 02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAF wI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0Y48IcxkI7V AKI48G6xCjnVAKz4kxM4IIrI8v6xkF7I0E8cxan2IY04v7MxAIw28IcxkI7VAKI48JMxC2 0s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI 0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE 14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20x vaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8 JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7IU8YFAJUUUUU== Content-Type: text/plain; charset="utf-8" When the mt7915 pci chip is detaching, the mt7915_crash_data is released in mt7915_coredump_unregister(). However, the work item dump_work may still be running or pending, leading to UAF bugs when the already freed crash_data is dereferenced again in mt7915_mac_dump_work(). The race condition can occur as follows: CPU 0 (removal path) | CPU 1 (workqueue) mt7915_pci_remove() | mt7915_sys_recovery_set() mt7915_unregister_device() | mt7915_reset() mt7915_coredump_unregister() | queue_work() vfree(dev->coredump.crash_data) | mt7915_mac_dump_work() | crash_data-> // UAF Fix this by ensuring dump_work is properly canceled before the crash_data is deallocated. Add cancel_work_sync() in mt7915_unregister_device() to synchronize with any pending or executing dump work. Fixes: 4dbcb9125cc3 ("wifi: mt76: mt7915: enable coredump support") Signed-off-by: Duoming Zhou --- drivers/net/wireless/mediatek/mt76/mt7915/init.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net= /wireless/mediatek/mt76/mt7915/init.c index 22443cbc74a..250c2d2479b 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c @@ -1294,6 +1294,7 @@ int mt7915_register_device(struct mt7915_dev *dev) =20 void mt7915_unregister_device(struct mt7915_dev *dev) { + cancel_work_sync(&dev->dump_work); mt7915_unregister_ext_phy(dev); mt7915_coredump_unregister(dev); mt7915_unregister_thermal(&dev->phy); --=20 2.34.1