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GET /api/patches/2224040/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 2224040,
    "url": "http://patchwork.ozlabs.org/api/patches/2224040/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260416155421.9876-1-Jonathan.Cameron@huawei.com/",
    "project": {
        "id": 14,
        "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api",
        "name": "QEMU Development",
        "link_name": "qemu-devel",
        "list_id": "qemu-devel.nongnu.org",
        "list_email": "qemu-devel@nongnu.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<20260416155421.9876-1-Jonathan.Cameron@huawei.com>",
    "list_archive_url": null,
    "date": "2026-04-16T15:54:21",
    "name": "[qemu] hw/cxl: Avoid out of bounds read when userspace requests data off end of CDAT.",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "dcd4276d6b95ac0f391d732cb0b4c16670d8669a",
    "submitter": {
        "id": 71988,
        "url": "http://patchwork.ozlabs.org/api/people/71988/?format=api",
        "name": "Jonathan Cameron",
        "email": "Jonathan.Cameron@huawei.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260416155421.9876-1-Jonathan.Cameron@huawei.com/mbox/",
    "series": [
        {
            "id": 500183,
            "url": "http://patchwork.ozlabs.org/api/series/500183/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500183",
            "date": "2026-04-16T15:54:21",
            "name": "[qemu] hw/cxl: Avoid out of bounds read when userspace requests data off end of CDAT.",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/500183/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2224040/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2224040/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>",
        "X-Original-To": "incoming@patchwork.ozlabs.org",
        "Delivered-To": "patchwork-incoming@legolas.ozlabs.org",
        "Authentication-Results": "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)",
        "Received": [
            "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxMzV0HBmz1yHP\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 17 Apr 2026 01:55:16 +1000 (AEST)",
            "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wDP38-0002LT-0o; Thu, 16 Apr 2026 11:54:38 -0400",
            "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <jonathan.cameron@huawei.com>)\n id 1wDP36-0002Ik-OL\n for qemu-devel@nongnu.org; Thu, 16 Apr 2026 11:54:36 -0400",
            "from frasgout.his.huawei.com ([185.176.79.56])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <jonathan.cameron@huawei.com>)\n id 1wDP33-00040T-VZ\n for qemu-devel@nongnu.org; Thu, 16 Apr 2026 11:54:36 -0400",
            "from mail.maildlp.com (unknown [172.18.224.107])\n by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4fxMy40wsfzHnGkW;\n Thu, 16 Apr 2026 23:54:04 +0800 (CST)",
            "from dubpeml500005.china.huawei.com (unknown [7.214.145.207])\n by mail.maildlp.com (Postfix) with ESMTPS id 6E3A240584;\n Thu, 16 Apr 2026 23:54:22 +0800 (CST)",
            "from SecurePC-101-06.huawei.com (10.123.51.176) by\n dubpeml500005.china.huawei.com (7.214.145.207) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id\n 15.2.1544.11; Thu, 16 Apr 2026 16:54:21 +0100"
        ],
        "To": "<buzzy0257@gmail.com>, <jic23@kernel.org>, <linxuarm@huawei.com>,\n <qemu-devel@nongnu.org>",
        "CC": "<linuxarm@huawei.com>, <berrange@redhat.com>",
        "Subject": "[PATCH qemu] hw/cxl: Avoid out of bounds read when userspace requests\n data off end of CDAT.",
        "Date": "Thu, 16 Apr 2026 16:54:21 +0100",
        "Message-ID": "<20260416155421.9876-1-Jonathan.Cameron@huawei.com>",
        "X-Mailer": "git-send-email 2.51.0",
        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "8bit",
        "Content-Type": "text/plain",
        "X-Originating-IP": "[10.123.51.176]",
        "X-ClientProxiedBy": "lhrpeml100010.china.huawei.com (7.191.174.197) To\n dubpeml500005.china.huawei.com (7.214.145.207)",
        "Received-SPF": "pass client-ip=185.176.79.56;\n envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com",
        "X-Spam_score_int": "-41",
        "X-Spam_score": "-4.2",
        "X-Spam_bar": "----",
        "X-Spam_report": "(-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no",
        "X-Spam_action": "no action",
        "X-BeenThere": "qemu-devel@nongnu.org",
        "X-Mailman-Version": "2.1.29",
        "Precedence": "list",
        "List-Id": "qemu development <qemu-devel.nongnu.org>",
        "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>",
        "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>",
        "List-Post": "<mailto:qemu-devel@nongnu.org>",
        "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>",
        "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>",
        "Reply-to": "Jonathan Cameron <Jonathan.Cameron@huawei.com>",
        "From": "Jonathan Cameron via qemu development <qemu-devel@nongnu.org>",
        "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org",
        "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"
    },
    "content": "The requested entry is controlled by the guest so must be checked against\nthe number of entries that actually exist.\n\nReported as a security issue, but CXL emulation has since been declared\nto not be suitable (yet) for virtualization use cases and so the security\nhandling policy does not apply.\n\nFixes: f5ee7413d592 (\"hw/mem/cxl-type3: Add CXL CDAT Data Object Exchange\")\nFixes: 882877fc359d (\"hw/pci-bridge/cxl-upstream: Add a CDAT table access DOE\")\nReported-by: Buzzy <buzzy0257@gmail.com>\nSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>\nCc: <jic23@kernel.org>\n---\n hw/mem/cxl_type3.c           | 4 ++++\n hw/pci-bridge/cxl_upstream.c | 4 ++++\n 2 files changed, 8 insertions(+)",
    "diff": "diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c\nindex 4739239da3c5..763b6a024403 100644\n--- a/hw/mem/cxl_type3.c\n+++ b/hw/mem/cxl_type3.c\n@@ -278,6 +278,10 @@ static bool cxl_doe_cdat_rsp(DOECap *doe_cap)\n     }\n \n     ent = req->entry_handle;\n+    if (ent >= cdat->entry_len) {\n+        return false;\n+    }\n+\n     base = cdat->entry[ent].base;\n     len = cdat->entry[ent].length;\n \ndiff --git a/hw/pci-bridge/cxl_upstream.c b/hw/pci-bridge/cxl_upstream.c\nindex b6281cbd4cb0..fa53fa2777fd 100644\n--- a/hw/pci-bridge/cxl_upstream.c\n+++ b/hw/pci-bridge/cxl_upstream.c\n@@ -158,6 +158,10 @@ static bool cxl_doe_cdat_rsp(DOECap *doe_cap)\n     }\n \n     ent = req->entry_handle;\n+    if (ent >= cdat->entry_len) {\n+        return false;\n+    }\n+\n     base = cdat->entry[ent].base;\n     len = cdat->entry[ent].length;\n \n",
    "prefixes": [
        "qemu"
    ]
}