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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 0ED93C2BA83 for ; Fri, 14 Feb 2020 16:32:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D05D424696 for ; Fri, 14 Feb 2020 16:32:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697926; bh=rjrhQW09Vso9tajVY7leCL9tNge/xnc21nLf2tfe578=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wq0WkgWt1OPBHwNu+GMxjK2BtR0loztn/M4QpsNcUwImdW3lLdR/B6Ah4b/1Rora2 tUkXZLnEPtlDltx/+QsGLb7vGA9k01Ytu+WhQap82zmxO53Yva2/Lph1wjydzA2Al3 oVrBVD2R6P0HDCLSQ34EcZq48OXTNpCHhWpgHsfQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405733AbgBNQb4 (ORCPT ); Fri, 14 Feb 2020 11:31:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:36084 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405869AbgBNQ0A (ORCPT ); Fri, 14 Feb 2020 11:26:00 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 011CD247DC; Fri, 14 Feb 2020 16:25:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697559; bh=rjrhQW09Vso9tajVY7leCL9tNge/xnc21nLf2tfe578=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2bO0Tolm7KXc8nhbGLHD/4fnzfDr3rA6nZureeNaA+aWtxZauKJvECwQYTDJoiPjs uwsA1pSY/3ehiXBHGoviWQtPbPwp3i2QaAq1GoNsjtjbL2laNxq/ABMk43f9Q2cjjh oThNYRnzuEDej4fhYWBYcKzUNIUcUf7IEmFuWOjI= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dan Carpenter , "David S . Miller" , Sasha Levin , linux-ide@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 076/100] ide: serverworks: potential overflow in svwks_set_pio_mode() Date: Fri, 14 Feb 2020 11:24:00 -0500 Message-Id: <20200214162425.21071-76-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214162425.21071-1-sashal@kernel.org> References: <20200214162425.21071-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-ide-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org From: Dan Carpenter [ Upstream commit ce1f31b4c0b9551dd51874dd5364654ed4ca13ae ] The "drive->dn" variable is a u8 controlled by root. Signed-off-by: Dan Carpenter Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/ide/serverworks.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/ide/serverworks.c b/drivers/ide/serverworks.c index a97affca18abe..0f57d45484d1d 100644 --- a/drivers/ide/serverworks.c +++ b/drivers/ide/serverworks.c @@ -114,6 +114,9 @@ static void svwks_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive) struct pci_dev *dev = to_pci_dev(hwif->dev); const u8 pio = drive->pio_mode - XFER_PIO_0; + if (drive->dn >= ARRAY_SIZE(drive_pci)) + return; + pci_write_config_byte(dev, drive_pci[drive->dn], pio_modes[pio]); if (svwks_csb_check(dev)) { @@ -140,6 +143,9 @@ static void svwks_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive) u8 ultra_enable = 0, ultra_timing = 0, dma_timing = 0; + if (drive->dn >= ARRAY_SIZE(drive_pci2)) + return; + pci_read_config_byte(dev, (0x56|hwif->channel), &ultra_timing); pci_read_config_byte(dev, 0x54, &ultra_enable); -- 2.20.1