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Tue, 02 Feb 2021 08:23:42 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-345-7o_RkinzNteieh4cjq6Bww-1; Tue, 02 Feb 2021 08:23:34 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6D62A107ACE3; Tue, 2 Feb 2021 13:23:33 +0000 (UTC) Received: from localhost.localdomain (ovpn-116-201.sin2.redhat.com [10.67.116.201]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4D8EF60C5F; Tue, 2 Feb 2021 13:23:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612272217; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=rpOffXP0hkEbeM+Mwn8LgrFhCB3xptKBDFYAWseahZc=; b=XmxP5ql4HrFUwiReblHjfEdFHFPeksuglS5E+oMwWIsalnbXF6U6XJ+ciXjfXiA4LJQCod gV6f9dz3rkf1VMO+9INbzxrlolGb3G2Hcxy5X+4MvYYxcc9OWO+hyxTWoNlMLld4jCqNzM Bgptfca9yhfLczNnNTkkU2PQNmGnZjg= X-MC-Unique: 7o_RkinzNteieh4cjq6Bww-1 From: P J P To: Paolo Bonzini Subject: [PATCH] scsi: mptsas: dequeue request object in case of an error (CVE-2021-3392) Date: Tue, 2 Feb 2021 18:51:03 +0530 Message-Id: <20210202132103.1096654-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=ppandit@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.205.24.124; envelope-from=ppandit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.386, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Cheolwoo Myung , QEMU Developers , Prasad J Pandit Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Prasad J Pandit While processing SCSI i/o requests in mptsas_process_scsi_io_request(), the Megaraid emulator appends new MPTSASRequest object 'req' to the 's->pending' queue. In case of an error, this same object gets dequeued in mptsas_free_request() only if SCSIRequest object 'req->sreq' is initialised. This may lead to a use-after-free issue. Unconditionally dequeue 'req' object from 's->pending' to avoid it. Fixes: CVE-2021-3392 Buglink: https://bugs.launchpad.net/qemu/+bug/1914236 Reported-by: Cheolwoo Myung Signed-off-by: Prasad J Pandit Reviewed-by: Li Qiang --- hw/scsi/mptsas.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/scsi/mptsas.c b/hw/scsi/mptsas.c index f86616544b..adff5b0bf2 100644 --- a/hw/scsi/mptsas.c +++ b/hw/scsi/mptsas.c @@ -257,8 +257,8 @@ static void mptsas_free_request(MPTSASRequest *req) req->sreq->hba_private =3D NULL; scsi_req_unref(req->sreq); req->sreq =3D NULL; - QTAILQ_REMOVE(&s->pending, req, next); } + QTAILQ_REMOVE(&s->pending, req, next); qemu_sglist_destroy(&req->qsg); g_free(req); } --=20 2.29.2