From nobody Tue Nov 26 21:41:27 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1703863695583760.1114543935909; Fri, 29 Dec 2023 07:28:15 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rJElj-0002ZY-NX; Fri, 29 Dec 2023 10:27:27 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rJElg-0002ZJ-W6 for qemu-devel@nongnu.org; Fri, 29 Dec 2023 10:27:25 -0500 Received: from mail.astralinux.ru ([217.74.38.119]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rJElf-0001tD-6L for qemu-devel@nongnu.org; Fri, 29 Dec 2023 10:27:24 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.astralinux.ru (Postfix) with ESMTP id E4EA71869409; Fri, 29 Dec 2023 18:27:08 +0300 (MSK) Received: from mail.astralinux.ru ([127.0.0.1]) by localhost (rbta-msk-vsrv-mail01.astralinux.ru [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id Cwxdms1_RbCD; Fri, 29 Dec 2023 18:27:08 +0300 (MSK) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.astralinux.ru (Postfix) with ESMTP id 9967A186942A; Fri, 29 Dec 2023 18:27:08 +0300 (MSK) Received: from mail.astralinux.ru ([127.0.0.1]) by localhost (rbta-msk-vsrv-mail01.astralinux.ru [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 10HuT6Jy75DA; Fri, 29 Dec 2023 18:27:08 +0300 (MSK) Received: from rbta-msk-lt-302690.astralinux.ru (unknown [10.177.233.160]) by mail.astralinux.ru (Postfix) with ESMTPSA id EFD6D1869409; Fri, 29 Dec 2023 18:27:07 +0300 (MSK) X-Virus-Scanned: amavisd-new at astralinux.ru From: Alexandra Diupina To: Paolo Bonzini Cc: Alexandra Diupina , Fam Zheng , qemu-devel@nongnu.org, sdl.qemu@linuxtesting.org Subject: [PATCH v2] esp: process the result of scsi_device_find() Date: Fri, 29 Dec 2023 18:26:47 +0300 Message-Id: <20231229152647.19699-1-adiupina@astralinux.ru> X-Mailer: git-send-email 2.30.2 In-Reply-To: References: MIME-Version: 1.0 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=217.74.38.119; envelope-from=adiupina@astralinux.ru; helo=mail.astralinux.ru X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1703863700174100003 Content-Type: text/plain; charset="utf-8" Add a 'current_lun' check for a null value to avoid null pointer dereferencing and recover host if NULL return Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 4eb8606560 (esp: store lun coming from the MESSAGE OUT phase) Signed-off-by: Alexandra Diupina --- v2: duplicate the scsi_device_find() logic from esp_select() hw/scsi/esp.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 9b11d8c573..03fdd53de6 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -292,6 +292,16 @@ static void do_command_phase(ESPState *s) esp_fifo_pop_buf(&s->cmdfifo, buf, cmdlen); =20 current_lun =3D scsi_device_find(&s->bus, 0, s->current_dev->id, s->lu= n); + + if (!current_lun) { + /* No such drive */ + s->rregs[ESP_RSTAT] =3D 0; + s->rregs[ESP_RINTR] =3D INTR_DC; + s->rregs[ESP_RSEQ] =3D SEQ_0; + esp_raise_irq(s); + return; + } + s->current_req =3D scsi_req_new(current_lun, 0, s->lun, buf, cmdlen, s= ); datalen =3D scsi_req_enqueue(s->current_req); s->ti_size =3D datalen; --=20 2.30.2