From patchwork Tue Jul 5 20:05:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Matteo Cascella X-Patchwork-Id: 12906997 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2C954C433EF for ; Tue, 5 Jul 2022 20:08:02 +0000 (UTC) Received: from localhost ([::1]:41916 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o8oq1-0001nJ-W1 for qemu-devel@archiver.kernel.org; Tue, 05 Jul 2022 16:08:02 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55652) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o8ooE-0000Zo-SN for qemu-devel@nongnu.org; Tue, 05 Jul 2022 16:06:10 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:42104) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o8ooA-0000Q2-8m for qemu-devel@nongnu.org; Tue, 05 Jul 2022 16:06:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1657051565; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=o0+SZhoZBty2UalGAt7idgrFE8ZMR/w4RB0biz2xMko=; b=Tojm5grNuSdceLhqVGXeZrCc8f8wR3eaB0EXoLjnzyflhd//1HL2pplNYcAx58ibv4JkPr snoFQAYTFBLWKZcOh+hkJMUczh69oiqKE9ZUhzcI+YV/XI0/1/Ut/jdKB3qd7VZHq9Y3Dp a7OHeW1HqKUgOVcgWIktakFfV/Z6H20= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-307-AFZcPvFLNUevx6RglH6f3Q-1; Tue, 05 Jul 2022 16:06:01 -0400 X-MC-Unique: AFZcPvFLNUevx6RglH6f3Q-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9BA21811E87; Tue, 5 Jul 2022 20:06:01 +0000 (UTC) Received: from f35-work.redhat.com (unknown [10.39.193.243]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A40DB400DFD0; Tue, 5 Jul 2022 20:06:00 +0000 (UTC) From: Mauro Matteo Cascella To: qemu-devel@nongnu.org Cc: mcascell@redhat.com, pbonzini@redhat.com, fam@euphon.net, thuth@redhat.com Subject: [PATCH] scsi/lsi53c895a: fix use-after-free in lsi_do_msgout (CVE-2022-0216) Date: Tue, 5 Jul 2022 22:05:43 +0200 Message-Id: <20220705200543.2366809-1-mcascell@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Received-SPF: pass client-ip=170.10.129.124; envelope-from=mcascell@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Set current_req->req to NULL to prevent reusing a free'd buffer in case of repeated SCSI cancel requests. Thanks to Thomas Huth for suggesting the patch. Fixes: CVE-2022-0216 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/972 Signed-off-by: Mauro Matteo Cascella Reviewed-by: Thomas Huth --- hw/scsi/lsi53c895a.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index c8773f73f7..99ea42d49b 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -1028,8 +1028,9 @@ static void lsi_do_msgout(LSIState *s) case 0x0d: /* The ABORT TAG message clears the current I/O process only. */ trace_lsi_do_msgout_abort(current_tag); - if (current_req) { + if (current_req && current_req->req) { scsi_req_cancel(current_req->req); + current_req->req = NULL; } lsi_disconnect(s); break;