From patchwork Fri Mar 5 12:22:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 394309 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 C3B76C433DB for ; Fri, 5 Mar 2021 12:41:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96D486502C for ; Fri, 5 Mar 2021 12:41:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232622AbhCEMk6 (ORCPT ); Fri, 5 Mar 2021 07:40:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:56164 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232532AbhCEMkn (ORCPT ); Fri, 5 Mar 2021 07:40:43 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0689664E84; Fri, 5 Mar 2021 12:40:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614948042; bh=wbmkcUqPiCV/4tE1uJG/lJv6hlg+wZVX5hO7HXeR1XM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pEIuapTDVFKU0ggxB5oN24BL/DMgLK0E9sTqsrwafMs7INJ+6Sj2OhoWuuy/7j21d 4NEq1Pq1NJaob06NP/QyNsnD4bEBUpLsGAu1YTwXOrPb8NanUUlFDkTrR32EU3PoMe 2upqmax5fPf7l7jOj8bGmwrwlIRuF8Ulo8mnc1OY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jiri Slaby , Sasha Levin Subject: [PATCH 4.14 21/39] vt/consolemap: do font sum unsigned Date: Fri, 5 Mar 2021 13:22:20 +0100 Message-Id: <20210305120852.834587657@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210305120851.751937389@linuxfoundation.org> References: <20210305120851.751937389@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jiri Slaby [ Upstream commit 9777f8e60e718f7b022a94f2524f967d8def1931 ] The constant 20 makes the font sum computation signed which can lead to sign extensions and signed wraps. It's not much of a problem as we build with -fno-strict-overflow. But if we ever decide not to, be ready, so switch the constant to unsigned. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20210105120239.28031-7-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/vt/consolemap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c index a5f88cf0f61d..a2c1a02f0407 100644 --- a/drivers/tty/vt/consolemap.c +++ b/drivers/tty/vt/consolemap.c @@ -493,7 +493,7 @@ con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos) p2[unicode & 0x3f] = fontpos; - p->sum += (fontpos << 20) + unicode; + p->sum += (fontpos << 20U) + unicode; return 0; }