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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 3DB14C3A5A1 for ; Thu, 22 Aug 2019 17:44:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0B73620856 for ; Thu, 22 Aug 2019 17:44:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566495853; bh=uxZkgyh2XRlpGrbfErOZ3RRf3skFrk/YeROxyq9d8A0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rCoj6wdJURzw7ErzehGr56JtfRIbc/MpHyZA59yUToIMVe/rzb43KHLa1zvaEQmFb aQU9V3Ty6qDWjCWsRAtSpnBDhECcckM32+rw/Ui50cShCdJfFraJGfYpnYGagW1cni 5rA5j0HnJk+Szneg9R/TjN8VhsAJoqk2KzhpLoxg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392750AbfHVRoL (ORCPT ); Thu, 22 Aug 2019 13:44:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:43218 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403937AbfHVRXY (ORCPT ); Thu, 22 Aug 2019 13:23:24 -0400 Received: from localhost (wsip-184-188-36-2.sd.sd.cox.net [184.188.36.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B8E3023402; Thu, 22 Aug 2019 17:23:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566494603; bh=uxZkgyh2XRlpGrbfErOZ3RRf3skFrk/YeROxyq9d8A0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l4bPDoiFULV0lRcgW9vqNzJaR60Oqbn1Zx/571f+bUBQ8MR/uhPzAh248e0ZDfG1V AbW8po0RzIQN4pNi8bNNiSaZF/omn2Dxa1fJca6FqZIC/hxx4kchYLenRhMDQpG9lb M3wirE8eokAiG3lS5RuEQAqOd49ygToLDfyjmZ8Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Junxiao Bi , Sumit Saxena , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.9 026/103] scsi: megaraid_sas: fix panic on loading firmware crashdump Date: Thu, 22 Aug 2019 10:18:14 -0700 Message-Id: <20190822171729.910717938@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190822171728.445189830@linuxfoundation.org> References: <20190822171728.445189830@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 3b5f307ef3cb5022bfe3c8ca5b8f2114d5bf6c29 ] While loading fw crashdump in function fw_crash_buffer_show(), left bytes in one dma chunk was not checked, if copying size over it, overflow access will cause kernel panic. Signed-off-by: Junxiao Bi Acked-by: Sumit Saxena Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/megaraid/megaraid_sas_base.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 5b1c37e3913cd..d90693b2767fd 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -2847,6 +2847,7 @@ megasas_fw_crash_buffer_show(struct device *cdev, u32 size; unsigned long buff_addr; unsigned long dmachunk = CRASH_DMA_BUF_SIZE; + unsigned long chunk_left_bytes; unsigned long src_addr; unsigned long flags; u32 buff_offset; @@ -2872,6 +2873,8 @@ megasas_fw_crash_buffer_show(struct device *cdev, } size = (instance->fw_crash_buffer_size * dmachunk) - buff_offset; + chunk_left_bytes = dmachunk - (buff_offset % dmachunk); + size = (size > chunk_left_bytes) ? chunk_left_bytes : size; size = (size >= PAGE_SIZE) ? (PAGE_SIZE - 1) : size; src_addr = (unsigned long)instance->crash_buf[buff_offset / dmachunk] + -- 2.20.1