From patchwork Wed May 12 14:47:44 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: 436662 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=-19.4 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, 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 C9CF3C2BA03 for ; Wed, 12 May 2021 16:19:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ABCFB61C8D for ; Wed, 12 May 2021 16:19:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235432AbhELQTn (ORCPT ); Wed, 12 May 2021 12:19:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:38980 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236110AbhELQLX (ORCPT ); Wed, 12 May 2021 12:11:23 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4943061D46; Wed, 12 May 2021 15:40:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620834044; bh=YqOFofuOdzYsQIUxsYo5jEgGPfN7n5zL14DIlrivLGU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xRnqSBIjSWgjTqRxzSX2kfekIuBWv3XHfdjspjQHXKdLTZDHDhr5tSVdzo9i3EBlC 6WWWWFUx0SJIY0U43DzKxTBQkEskjLjWOVNwa3PX+bG0dnz/RcMzDV5RSQcnie+Z+r 6izyATIReloybktPXTF8UJgMaLbaAjrlG6+QRsH8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kernel test robot , Dan Carpenter , Christoph Hellwig , Jens Axboe , Sasha Levin Subject: [PATCH 5.11 387/601] ataflop: fix off by one in ataflop_probe() Date: Wed, 12 May 2021 16:47:44 +0200 Message-Id: <20210512144840.545798878@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144827.811958675@linuxfoundation.org> References: <20210512144827.811958675@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dan Carpenter [ Upstream commit b777f4c47781df6b23e3f4df6fdb92d9aceac7bb ] Smatch complains that the "type > NUM_DISK_MINORS" should be >= instead of >. We also need to subtract one from "type" at the start. Fixes: bf9c0538e485 ("ataflop: use a separate gendisk for each media format") Reported-by: kernel test robot Signed-off-by: Dan Carpenter Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/ataflop.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c index aed2c2a4f4ea..d601e49f80e0 100644 --- a/drivers/block/ataflop.c +++ b/drivers/block/ataflop.c @@ -2001,7 +2001,10 @@ static void ataflop_probe(dev_t dev) int drive = MINOR(dev) & 3; int type = MINOR(dev) >> 2; - if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS) + if (type) + type--; + + if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS) return; mutex_lock(&ataflop_probe_lock); if (!unit[drive].disk[type]) {