From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C9DBC4338F for ; Tue, 24 Aug 2021 17:15:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2616760462 for ; Tue, 24 Aug 2021 17:15:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240082AbhHXRQk (ORCPT ); Tue, 24 Aug 2021 13:16:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:51256 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233847AbhHXRNF (ORCPT ); Tue, 24 Aug 2021 13:13:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9B55061A6F; Tue, 24 Aug 2021 17:01:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629824485; bh=3PJRue57pZulaQVtzSOeEWSj/FzuT3/x/imhPvTjLLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ujQ8gR4opkGCaLugoYmhBNBA5TflzStjTTNHCRGt6RrjdT0zX3Pt30thhAeKOuwGi /GOlTrfmamoBWiKfYep8LsgidSegKfbo0Vdr6/oVhmNxxghbtMJGBygzAZS+QrWnWL TYl/yL0DcHedZ6znO1Ev27Isd0ki7jx/BKeeh52jGe8x+yOb7jyXMnzY8gGsBeStoy nb4r5IY8fNkzg6+5dbqSjPYfz2688kH/YQgo7JqWw3qbDKDj5kRx4oiDdFuKmNIqJH /XHi37tuQKmX6N+y4MMy81EG4mhGvlorKoKHJUEqtTxTitInb8z5qiK9nszx6ayhAb 8MJyLlE0444aQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Harshvardhan Jha , Sumit Saxena , "Martin K . Petersen" , Sasha Levin Subject: [PATCH 5.4 17/61] scsi: megaraid_mm: Fix end of loop tests for list_for_each_entry() Date: Tue, 24 Aug 2021 13:00:22 -0400 Message-Id: <20210824170106.710221-18-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210824170106.710221-1-sashal@kernel.org> References: <20210824170106.710221-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.4.143-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-5.4.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 5.4.143-rc1 X-KernelTest-Deadline: 2021-08-26T17:01+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Harshvardhan Jha [ Upstream commit 77541f78eadfe9fdb018a7b8b69f0f2af2cf4b82 ] The list_for_each_entry() iterator, "adapter" in this code, can never be NULL. If we exit the loop without finding the correct adapter then "adapter" points invalid memory that is an offset from the list head. This will eventually lead to memory corruption and presumably a kernel crash. Link: https://lore.kernel.org/r/20210708074642.23599-1-harshvardhan.jha@oracle.com Acked-by: Sumit Saxena Signed-off-by: Harshvardhan Jha Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/megaraid/megaraid_mm.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_mm.c b/drivers/scsi/megaraid/megaraid_mm.c index 59cca898f088..fcfbf3343b64 100644 --- a/drivers/scsi/megaraid/megaraid_mm.c +++ b/drivers/scsi/megaraid/megaraid_mm.c @@ -246,7 +246,7 @@ mraid_mm_get_adapter(mimd_t __user *umimd, int *rval) mimd_t mimd; uint32_t adapno; int iterator; - + bool is_found; if (copy_from_user(&mimd, umimd, sizeof(mimd_t))) { *rval = -EFAULT; @@ -262,12 +262,16 @@ mraid_mm_get_adapter(mimd_t __user *umimd, int *rval) adapter = NULL; iterator = 0; + is_found = false; list_for_each_entry(adapter, &adapters_list_g, list) { - if (iterator++ == adapno) break; + if (iterator++ == adapno) { + is_found = true; + break; + } } - if (!adapter) { + if (!is_found) { *rval = -ENODEV; return NULL; } @@ -733,6 +737,7 @@ ioctl_done(uioc_t *kioc) uint32_t adapno; int iterator; mraid_mmadp_t* adapter; + bool is_found; /* * When the kioc returns from driver, make sure it still doesn't @@ -755,19 +760,23 @@ ioctl_done(uioc_t *kioc) iterator = 0; adapter = NULL; adapno = kioc->adapno; + is_found = false; con_log(CL_ANN, ( KERN_WARNING "megaraid cmm: completed " "ioctl that was timedout before\n")); list_for_each_entry(adapter, &adapters_list_g, list) { - if (iterator++ == adapno) break; + if (iterator++ == adapno) { + is_found = true; + break; + } } kioc->timedout = 0; - if (adapter) { + if (is_found) mraid_mm_dealloc_kioc( adapter, kioc ); - } + } else { wake_up(&wait_q); -- 2.30.2