From patchwork Thu Jul 27 15:39:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandra Diupina X-Patchwork-Id: 707454 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0836C001DC for ; Thu, 27 Jul 2023 15:40:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233144AbjG0PkG (ORCPT ); Thu, 27 Jul 2023 11:40:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232813AbjG0PkE (ORCPT ); Thu, 27 Jul 2023 11:40:04 -0400 Received: from mail.astralinux.ru (mail.astralinux.ru [217.74.38.119]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 133052122; Thu, 27 Jul 2023 08:40:03 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.astralinux.ru (Postfix) with ESMTP id 17BB7186AAC1; Thu, 27 Jul 2023 18:39:30 +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 Z4YePX_NlhbN; Thu, 27 Jul 2023 18:39:29 +0300 (MSK) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.astralinux.ru (Postfix) with ESMTP id B7655186AAA0; Thu, 27 Jul 2023 18:39:29 +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 lEd70ON9ivQv; Thu, 27 Jul 2023 18:39:29 +0300 (MSK) Received: from rbta-msk-lt-302690.astralinux.ru (unknown [10.177.233.132]) by mail.astralinux.ru (Postfix) with ESMTPSA id DFA7E186AA6C; Thu, 27 Jul 2023 18:39:28 +0300 (MSK) From: Alexandra Diupina To: "James E.J. Bottomley" Cc: Alexandra Diupina , "Martin K. Petersen" , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, lvc-project@linuxtesting.org, Vladimir Telezhnikov Subject: [PATCH] 53c700: add 'slot' check to NULL Date: Thu, 27 Jul 2023 18:39:25 +0300 Message-Id: <20230727153925.15297-1-adiupina@astralinux.ru> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org The 'slot' variable allows a NULL value. It is necessary to add a check for a null value to avoid dereferencing the null pointer. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Co-developed-by: Vladimir Telezhnikov Signed-off-by: Vladimir Telezhnikov Signed-off-by: Alexandra Diupina --- drivers/scsi/53c700.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c index e1e4f9d10887..8e5468d1733d 100644 --- a/drivers/scsi/53c700.c +++ b/drivers/scsi/53c700.c @@ -1598,6 +1598,8 @@ NCR_700_intr(int irq, void *dev_id) printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG))); #endif resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch; + } else if (!slot) { + printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n"); } else if(dsp >= to32bit(&slot->pSG[0].ins) && dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) { int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;