From patchwork Mon Dec 18 15:02:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandra Diupina X-Patchwork-Id: 13497094 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 B61DCC35274 for ; Mon, 18 Dec 2023 15:03:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rFF96-0000tx-DF; Mon, 18 Dec 2023 10:03:04 -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 1rFF93-0000sc-Rd for qemu-devel@nongnu.org; Mon, 18 Dec 2023 10:03:01 -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 1rFF90-00071o-WA for qemu-devel@nongnu.org; Mon, 18 Dec 2023 10:03:01 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.astralinux.ru (Postfix) with ESMTP id 911801865441; Mon, 18 Dec 2023 18:02:45 +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 FE7XX7_tHYmH; Mon, 18 Dec 2023 18:02:45 +0300 (MSK) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.astralinux.ru (Postfix) with ESMTP id 4418D1863F97; Mon, 18 Dec 2023 18:02:45 +0300 (MSK) X-Virus-Scanned: amavisd-new at astralinux.ru 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 bcramVC_7dm3; Mon, 18 Dec 2023 18:02:45 +0300 (MSK) Received: from rbta-msk-lt-302690.astralinux.ru (unknown [10.177.236.41]) by mail.astralinux.ru (Postfix) with ESMTPSA id 8190C1863B29; Mon, 18 Dec 2023 18:02:44 +0300 (MSK) From: Alexandra Diupina To: Paolo Bonzini Cc: Alexandra Diupina , Fam Zheng , qemu-devel@nongnu.org, sdl.qemu@linuxtesting.org Subject: [PATCH] esp: process the result of scsi_device_find() Date: Mon, 18 Dec 2023 18:02:13 +0300 Message-Id: <20231218150213.27253-1-adiupina@astralinux.ru> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add a 'current_lun' check for a null value to avoid null pointer dereferencing 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 --- hw/scsi/esp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 9b11d8c573..3a2ec35f9b 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -292,6 +292,11 @@ static void do_command_phase(ESPState *s) esp_fifo_pop_buf(&s->cmdfifo, buf, cmdlen); current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, s->lun); + + if (!current_lun) { + return; + } + s->current_req = scsi_req_new(current_lun, 0, s->lun, buf, cmdlen, s); datalen = scsi_req_enqueue(s->current_req); s->ti_size = datalen;