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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03037C7EE22 for ; Sun, 7 May 2023 00:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230443AbjEGAze (ORCPT ); Sat, 6 May 2023 20:55:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230431AbjEGAzQ (ORCPT ); Sat, 6 May 2023 20:55:16 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68BEF1993F; Sat, 6 May 2023 17:53:42 -0700 (PDT) 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 C97E461548; Sun, 7 May 2023 00:35:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4BC7EC433D2; Sun, 7 May 2023 00:35:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683419743; bh=U1T2evskaLiklMZRE+CQy1wv86bZejcZV645N5cjG6c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HYMUFoxBxACx/eOJ81CeR5m8DET6Mg9Rx14VoKHZm/pWhN+vAd7KkjsxM0elGj6BW FgJoVa5prRUo+osNvWUIGrCFeYsEznYk4vIxKYUsCg3UbhbwkPhNMaQv45wfkCcrM5 12FTVrYC9W5xF4JnqyyRdvVGPSyP/NXx+Iob0q8+6x8UhQd/5VVuK0JRDln3wqtQRb gC3sJ5hFAoKM59+olcpW64crLh6F9aj4llMIU3ENGyTSbujewsvXWZKoBNdMTGotvt M3GQ5pTC1vK5zxdbOgpTEdOakvdE3UaLwY+Nhm1ZQ/I2BLPFSWq3S1KmNikFsq6f+1 Gmw5cot49PjFw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?Rodr=C3=ADguez=20Barbarin=2C=20Jos=C3=A9=20Javier?= , Jorge Sanjuan Garcia , Javier Rodriguez , Johannes Thumshirn , Greg Kroah-Hartman , Sasha Levin , morbidrsa@gmail.com Subject: [PATCH AUTOSEL 5.15 10/10] mcb-pci: Reallocate memory region to avoid memory overlapping Date: Sat, 6 May 2023 20:35:16 -0400 Message-Id: <20230507003517.4078384-10-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230507003517.4078384-1-sashal@kernel.org> References: <20230507003517.4078384-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Rodríguez Barbarin, José Javier [ Upstream commit 9be24faadd085c284890c3afcec7a0184642315a ] mcb-pci requests a fixed-size memory region to parse the chameleon table, however, if the chameleon table is smaller that the allocated region, it could overlap with the IP Cores' memory regions. After parsing the chameleon table, drop/reallocate the memory region with the actual chameleon table size. Co-developed-by: Jorge Sanjuan Garcia Signed-off-by: Jorge Sanjuan Garcia Signed-off-by: Javier Rodriguez Signed-off-by: Johannes Thumshirn Link: https://lore.kernel.org/r/20230411083329.4506-3-jth@kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/mcb/mcb-pci.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c index dc88232d9af83..53d9202ff9a7c 100644 --- a/drivers/mcb/mcb-pci.c +++ b/drivers/mcb/mcb-pci.c @@ -31,7 +31,7 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct resource *res; struct priv *priv; - int ret; + int ret, table_size; unsigned long flags; priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL); @@ -90,7 +90,30 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (ret < 0) goto out_mcb_bus; - dev_dbg(&pdev->dev, "Found %d cells\n", ret); + table_size = ret; + + if (table_size < CHAM_HEADER_SIZE) { + /* Release the previous resources */ + devm_iounmap(&pdev->dev, priv->base); + devm_release_mem_region(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE); + + /* Then, allocate it again with the actual chameleon table size */ + res = devm_request_mem_region(&pdev->dev, priv->mapbase, + table_size, + KBUILD_MODNAME); + if (!res) { + dev_err(&pdev->dev, "Failed to request PCI memory\n"); + ret = -EBUSY; + goto out_mcb_bus; + } + + priv->base = devm_ioremap(&pdev->dev, priv->mapbase, table_size); + if (!priv->base) { + dev_err(&pdev->dev, "Cannot ioremap\n"); + ret = -ENOMEM; + goto out_mcb_bus; + } + } mcb_bus_add_devices(priv->bus); -- 2.39.2