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=-21.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 A32F3C4338F for ; Fri, 30 Jul 2021 12:05:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86B5B61059 for ; Fri, 30 Jul 2021 12:05:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238698AbhG3MFp (ORCPT ); Fri, 30 Jul 2021 08:05:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:45638 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230263AbhG3MFp (ORCPT ); Fri, 30 Jul 2021 08:05:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 955DD60F01; Fri, 30 Jul 2021 12:05:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627646740; bh=/YlnU4V3aPDSJabKbYYPbeEQmm/CqFf1w/7AEVfRlFY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=OCnEFos0dJ2x7MMIS264xEhMeVRksdxI281u3TeuppryAu0qZNns6/HavEw2ZmnSM JKkgPHFZGnTN0pMJha1YMZKpaCQ6kNcLwhd0uTn0r14upyD8smdxAuxOelTDFSBbUI D3L7yIQqQerdQWBtOrecQCWzI23Bc5+u4/9/vUrYaHRl33+7MrP28hT799aiFzCfCB n6hIc6yJAvd1uGh5uXRVws93pBX0j9yk0A9xsTCxvnF3XDlsi+rbEXwAV4oWEqMlQH B2JSK7L96ho5qjc54RA/7zmg3vO56GEIFmcuJLQqzcyu4lDY4ufIYsYzixcs4x8e5e 82sjCEO1CaubA== Date: Fri, 30 Jul 2021 07:08:13 -0500 From: "Gustavo A. R. Silva" To: linux-kernel@vger.kernel.org Cc: Yong Zhi , Sakari Ailus , Bingbu Cao , Tianshu Qiu , Mauro Carvalho Chehab , Greg Kroah-Hartman , linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-hardening@vger.kernel.org, "Gustavo A. R. Silva" , Dan Carpenter Subject: [PATCH v2 1/2] media: staging/intel-ipu3: css: Fix wrong size comparison Message-ID: <184d96f95d6261b1a91704eb68adbd0a2e1c2cc2.1627646101.git.gustavoars@kernel.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org There is a wrong comparison of the total size of the loaded firmware css->fw->size with the size of a pointer to struct imgu_fw_header. Fix this by using the right operand 'struct imgu_fw_header' for sizeof, instead of 'struct imgu_fw_header *' and turn binary_header into a flexible-array member. Also, adjust the relational operator to be '<=' instead of '<', as it seems that the intention of the comparison is to determine if the loaded firmware contains any 'struct imgu_fw_info' items in the binary_header[] array than merely the file_header (struct imgu_fw_bi_file_h). The replacement of the one-element array with a flexible-array member also help with the ongoing efforts to globally enable -Warray-bounds and get us closer to being able to tighten the FORTIFY_SOURCE routines on memcpy(). Link: https://github.com/KSPP/linux/issues/79 Link: https://github.com/KSPP/linux/issues/109 Fixes: 09d290f0ba21 ("media: staging/intel-ipu3: css: Add support for firmware management") Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva --- It'd be just great if someone that knows this code better can confirm these changes are correct. In particular the adjustment of the relational operator. Thanks! Changes in v2: - Use flexible array and adjust relational operator, accordingly. - Update changelog text. drivers/staging/media/ipu3/ipu3-css-fw.c | 2 +- drivers/staging/media/ipu3/ipu3-css-fw.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/media/ipu3/ipu3-css-fw.c b/drivers/staging/media/ipu3/ipu3-css-fw.c index 45aff76198e2..630cb5186b48 100644 --- a/drivers/staging/media/ipu3/ipu3-css-fw.c +++ b/drivers/staging/media/ipu3/ipu3-css-fw.c @@ -124,7 +124,7 @@ int imgu_css_fw_init(struct imgu_css *css) /* Check and display fw header info */ css->fwp = (struct imgu_fw_header *)css->fw->data; - if (css->fw->size < sizeof(struct imgu_fw_header *) || + if (css->fw->size <= sizeof(struct imgu_fw_header) || css->fwp->file_header.h_size != sizeof(struct imgu_fw_bi_file_h)) goto bad_fw; if (sizeof(struct imgu_fw_bi_file_h) + diff --git a/drivers/staging/media/ipu3/ipu3-css-fw.h b/drivers/staging/media/ipu3/ipu3-css-fw.h index 3c078f15a295..c0bc57fd678a 100644 --- a/drivers/staging/media/ipu3/ipu3-css-fw.h +++ b/drivers/staging/media/ipu3/ipu3-css-fw.h @@ -171,7 +171,7 @@ struct imgu_fw_bi_file_h { struct imgu_fw_header { struct imgu_fw_bi_file_h file_header; - struct imgu_fw_info binary_header[1]; /* binary_nr items */ + struct imgu_fw_info binary_header[]; /* binary_nr items */ }; /******************* Firmware functions *******************/ -- 2.27.0