From patchwork Thu Jan 20 21:24:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 12719080 X-Patchwork-Delegate: gustavo@embeddedor.com 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 360CBC433EF for ; Thu, 20 Jan 2022 21:18:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347108AbiATVSA (ORCPT ); Thu, 20 Jan 2022 16:18:00 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:60290 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242456AbiATVSA (ORCPT ); Thu, 20 Jan 2022 16:18:00 -0500 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 dfw.source.kernel.org (Postfix) with ESMTPS id D998861884; Thu, 20 Jan 2022 21:17:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07916C340E3; Thu, 20 Jan 2022 21:17:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642713479; bh=8vLe+3vRBl+4dO3EZ6a5gaJmwld5AtI9w7i6K+Ckdy0=; h=Date:From:To:Cc:Subject:From; b=mrufb3EIK+jrdzU98CNotfSYG0SuglkelIIFpndca12AIJ+9QDHSEq/W4479rv4Aw 7aSLJeCXAjywAGYvb74in0EArJpEEBuY5qJknlCg1FSfOqoAUjIjYYeyU0NLpdcPDw NnEPqcBEZfve1AC/vODlv6lapkB7hsXN9WCg/MxXfLEa7Dh9NbC38te3C92yeFw3JY TJ0Ola9vr6DCSR2UNWk6/Az4VBVNaS8nWaKpDWKEX14yD8nv/NqML1RA+rA/tt8RcT T6zzCs/6rxx5IqSPpXYjipW6BdMJ7kSFhLVLBnN5CnFSph7JRLZCAn+/vxq9DuWXlZ jJehLgHLdDRuw== Date: Thu, 20 Jan 2022 15:24:34 -0600 From: "Gustavo A. R. Silva" To: Hans Verkuil , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH][next] media: usb: pwc-uncompress: Use struct_size() helper in pwc_decompress() Message-ID: <20220120212434.GA30630@embeddedor> MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org Make use of the struct_size() helper instead of an open-coded version, in order to avoid any potential type mistakes or integer overflows that, in the worst scenario, could lead to heap overflows. Also, address the following sparse warnings: drivers/media/usb/pwc/pwc-uncompress.c:44:44: warning: using sizeof on a flexible structure Link: https://github.com/KSPP/linux/issues/174 Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook --- drivers/media/usb/pwc/pwc-uncompress.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/pwc/pwc-uncompress.c b/drivers/media/usb/pwc/pwc-uncompress.c index 68bc3829c6b3..faf44cdeb268 100644 --- a/drivers/media/usb/pwc/pwc-uncompress.c +++ b/drivers/media/usb/pwc/pwc-uncompress.c @@ -41,7 +41,7 @@ int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf) memcpy(raw_frame->cmd, pdev->cmd_buf, 4); memcpy(raw_frame+1, yuv, pdev->frame_size); vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0, - pdev->frame_size + sizeof(struct pwc_raw_frame)); + struct_size(raw_frame, rawframe, pdev->frame_size)); return 0; }