From nobody Thu Feb 12 23:04:47 2026 Received: from mx0a-0064b401.pphosted.com (mx0a-0064b401.pphosted.com [205.220.166.238]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7796F26281; Fri, 3 Jan 2025 07:04:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.166.238 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735887885; cv=none; b=fBEc5c1EimZjGn4+G0Zwr9wAd+MV4GUpYeAzfMGntHav3KkXoI5w4uRMTPd6tV5EelOYYiV8kaAO3hhYfm0M9X7FnIkWjbmH2ERzgZoIS0RXEFTvbQaDDJnFiFrzbBNnOO7EbKWZAgRwbs3e7AJlMZ9Q0vudKTNVv7GWucHjgo0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735887885; c=relaxed/simple; bh=JgEyWt5hzpzISIA1DUDRlAo9FVhj6vvqe5FuuP/r7VA=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=in7o5XJJEIyIETMCNevK0OUDHIQJDxlCoflXfob11KZW9wJZO5skPHPEJR8fOriyyTUnNjkltTKMLTreh2Wsib8UBKdhOWX8oLadRSlJmDRCW+dhgY3DYrY7EtKuHy+jGhxOfq6mJMfeGNm2sxKjUdFaIXNbCIEuibIIaqezfFQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=windriver.com; spf=pass smtp.mailfrom=windriver.com; arc=none smtp.client-ip=205.220.166.238 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=windriver.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=windriver.com Received: from pps.filterd (m0250809.ppops.net [127.0.0.1]) by mx0a-0064b401.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 5036uarg007523; Thu, 2 Jan 2025 23:04:23 -0800 Received: from ala-exchng01.corp.ad.wrs.com (ala-exchng01.wrs.com [147.11.82.252]) by mx0a-0064b401.pphosted.com (PPS) with ESMTPS id 43thqq4mu4-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Thu, 02 Jan 2025 23:04:23 -0800 (PST) Received: from ALA-EXCHNG02.corp.ad.wrs.com (147.11.82.254) by ala-exchng01.corp.ad.wrs.com (147.11.82.252) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.43; Thu, 2 Jan 2025 23:04:22 -0800 Received: from pek-lpg-core1.wrs.com (147.11.136.210) by ALA-EXCHNG02.corp.ad.wrs.com (147.11.82.254) with Microsoft SMTP Server id 15.1.2507.43 via Frontend Transport; Thu, 2 Jan 2025 23:04:20 -0800 From: To: CC: , , , , , , Subject: [PATCH 6.1.y] i3c: master: cdns: Fix use after free vulnerability in cdns_i3c_master Driver Due to Race Condition Date: Fri, 3 Jan 2025 15:04:20 +0800 Message-ID: <20250103070420.64714-1-jianqi.ren.cn@windriver.com> X-Mailer: git-send-email 2.25.1 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-Authority-Analysis: v=2.4 cv=RoI/LDmK c=1 sm=1 tr=0 ts=67778bf7 cx=c_pps a=/ZJR302f846pc/tyiSlYyQ==:117 a=/ZJR302f846pc/tyiSlYyQ==:17 a=VdSt8ZQiCzkA:10 a=VwQbUJbxAAAA:8 a=P-IC7800AAAA:8 a=t7CeM3EgAAAA:8 a=7vRtop612t4TABFKEpQA:9 a=d3PnA9EDa4IxuAV0gXij:22 a=FdTzh2GWekK77mhwV6Dw:22 X-Proofpoint-GUID: MrQQXBkYJNEOx04U5bT8dgVwxB6WF01K X-Proofpoint-ORIG-GUID: MrQQXBkYJNEOx04U5bT8dgVwxB6WF01K X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-02_03,2025-01-02_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 mlxscore=0 phishscore=0 suspectscore=0 clxscore=1015 impostorscore=0 malwarescore=0 mlxlogscore=789 adultscore=0 bulkscore=0 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.21.0-2411120000 definitions=main-2501030059 Content-Type: text/plain; charset="utf-8" From: Kaixin Wang [ Upstream commit 609366e7a06d035990df78f1562291c3bf0d4a12 ] In the cdns_i3c_master_probe function, &master->hj_work is bound with cdns_i3c_master_hj. And cdns_i3c_master_interrupt can call cnds_i3c_master_demux_ibis function to start the work. If we remove the module which will call cdns_i3c_master_remove to make cleanup, it will free master->base through i3c_master_unregister while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | cdns_i3c_master_hj cdns_i3c_master_remove | i3c_master_unregister(&master->base) | device_unregister(&master->dev) | device_release | //free master->base | | i3c_master_do_daa(&master->base) | //use master->base Fix it by ensuring that the work is canceled before proceeding with the cleanup in cdns_i3c_master_remove. Signed-off-by: Kaixin Wang Link: https://lore.kernel.org/r/20240911153544.848398-1-kxwang23@m.fudan.ed= u.cn Signed-off-by: Alexandre Belloni Signed-off-by: Jianqi Ren --- drivers/i3c/master/i3c-master-cdns.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-= master-cdns.c index b9cfda6ae9ae..4473c0b1ae2e 100644 --- a/drivers/i3c/master/i3c-master-cdns.c +++ b/drivers/i3c/master/i3c-master-cdns.c @@ -1668,6 +1668,7 @@ static int cdns_i3c_master_remove(struct platform_dev= ice *pdev) struct cdns_i3c_master *master =3D platform_get_drvdata(pdev); int ret; =20 + cancel_work_sync(&master->hj_work); ret =3D i3c_master_unregister(&master->base); if (ret) return ret; --=20 2.25.1