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 916E2C432C0 for ; Fri, 22 Nov 2019 11:06:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6057A2089D for ; Fri, 22 Nov 2019 11:06:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574420777; bh=7uykPxA/I2LccFSMWbafqDlyn70uAtU8Wu+4C3s1Uj4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LUng8GMVm7nrLvnNbl6ZBbEc/rjAHmWEhGrVPt0H1xfBZw+jWcz8QctqEg0/TBybs E2eXL8XSSoAtixfbybm+JsPSg+8GZhrFONbBhvOfvD31MjWSoyaXtwVqBsIrFGeHjp 7JprR8hFTTYpF1lyvwt6j5zU43vZ7uiQNjpb9fPA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730406AbfKVLGQ (ORCPT ); Fri, 22 Nov 2019 06:06:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:34256 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731815AbfKVLGL (ORCPT ); Fri, 22 Nov 2019 06:06:11 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 1E5082075E; Fri, 22 Nov 2019 11:06:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574420770; bh=7uykPxA/I2LccFSMWbafqDlyn70uAtU8Wu+4C3s1Uj4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F5G5EXlJY10mnQzQhAnsPuV68Fx+9lLlBG67GVwUSbPhxkbSELjkO/nQ3ZapzCLyS 6RGCWSWrwN/5Eh82whn/YynJg7K61a9LYv7ciT1odIgtVI05Egj8BzaCbBWJOOyyx4 6cy+7vcyWUgbCxFaqiEqz28Hy8oY7V7SCVxG2kCY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 4.19 176/220] media: cx231xx: fix potential sign-extension overflow on large shift Date: Fri, 22 Nov 2019 11:29:01 +0100 Message-Id: <20191122100925.510342763@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191122100912.732983531@linuxfoundation.org> References: <20191122100912.732983531@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 From: Colin Ian King [ Upstream commit 32ae592036d7aeaabcccb2b1715373a68639a768 ] Shifting the u8 value[3] by an int can lead to sign-extension overflow. For example, if value[3] is 0xff and the shift is 24 then it is promoted to int and then the top bit is sign-extended so that all upper 32 bits are set. Fix this by casting value[3] to a u32 before the shift. Detected by CoverityScan, CID#1016522 ("Unintended sign extension") Fixes: e0d3bafd0258 ("V4L/DVB (10954): Add cx231xx USB driver") Signed-off-by: Colin Ian King Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/cx231xx/cx231xx-video.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c index f7fcd733a2ca8..963739fa86718 100644 --- a/drivers/media/usb/cx231xx/cx231xx-video.c +++ b/drivers/media/usb/cx231xx/cx231xx-video.c @@ -1389,7 +1389,7 @@ int cx231xx_g_register(struct file *file, void *priv, ret = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER, (u16)reg->reg, value, 4); reg->val = value[0] | value[1] << 8 | - value[2] << 16 | value[3] << 24; + value[2] << 16 | (u32)value[3] << 24; reg->size = 4; break; case 1: /* AFE - read byte */ -- 2.20.1