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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57CCDC433F5 for ; Fri, 28 Jan 2022 10:17:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344209AbiA1KRp (ORCPT ); Fri, 28 Jan 2022 05:17:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40124 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344967AbiA1KRY (ORCPT ); Fri, 28 Jan 2022 05:17:24 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6514DC061714; Fri, 28 Jan 2022 02:17:23 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 307CFB82513; Fri, 28 Jan 2022 10:17:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 479D6C340E8; Fri, 28 Jan 2022 10:17:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643365040; bh=TS3ZHEXIHp9rGILPKv/FSpRiPRtUzwCDCOlCFn5B+no=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jCBcr0AbPP7BoKtnFXY2BdMSNgxOz2/wIHtgt0lkvgbdmyldY+uWKVDv5H4ge8PPH lKB7dN0sGj06Yvk0xBAKireqO7udEXN7ntMkXWJREwcw3MQ1BxV4GCgbecD7IjN8nf QlUG/E63vzkXmma51jq22b9ZSFADATezi0gfLubg= Date: Fri, 28 Jan 2022 11:17:18 +0100 From: Greg KH To: Zhou Qingyang Cc: kjlu@umn.edu, Tiffany Lin , Andrew-CT Chen , Mauro Carvalho Chehab , Matthias Brugger , Hans Verkuil , Alexandre Courbot , linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] media: mtk-vcodec: media: mtk-vcodec: Fix a NULL pointer dereference in mtk_vcodec_fw_vpu_init() Message-ID: References: <20220124171503.61098-1-zhou1615@umn.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220124171503.61098-1-zhou1615@umn.edu> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On Tue, Jan 25, 2022 at 01:15:03AM +0800, Zhou Qingyang wrote: > In mtk_vcodec_fw_vpu_init(), devm_kzalloc() is assigned to fw and there is > a dereference of it right after that, which could lead to NULL pointer > dereference on failure of devm_kzalloc(). > > Fix this bug by adding a NULL check of fw. > > This bug was found by a static analyzer. > > Builds with 'make allyesconfig' show no new warnings, > and our static analyzer no longer warns about this code. > > Fixes: 46233e91fa24 ("media: mtk-vcodec: move firmware implementations into their own files") > Signed-off-by: Zhou Qingyang > --- > The analysis employs differential checking to identify inconsistent > security operations (e.g., checks or kfrees) between two code paths > and confirms that the inconsistent operations are not recovered in the > current function or the callers, so they constitute bugs. > > Note that, as a bug found by static analysis, it can be a false > positive or hard to trigger. Multiple researchers have cross-reviewed > the bug. > > drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c > index cd27f637dbe7..33ae88a9f9da 100644 > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c > @@ -102,6 +102,9 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_vpu_init(struct mtk_vcodec_dev *dev, > vpu_wdt_reg_handler(fw_pdev, mtk_vcodec_vpu_reset_handler, dev, rst_id); > > fw = devm_kzalloc(&dev->plat_dev->dev, sizeof(*fw), GFP_KERNEL); > + if (!fw) > + return ERR_PTR(-ENOMEM); > + > fw->type = VPU; > fw->ops = &mtk_vcodec_vpu_msg; > fw->pdev = fw_pdev; > -- > 2.25.1 > As stated before, umn.edu is still not allowed to contribute to the Linux kernel. Please work with your administration to resolve this issue.