From patchwork Tue Jan 5 13:57:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 11998977 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=-13.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MIME_HEADER_CTYPE_ONLY,SPF_HELO_NONE,SPF_PASS, T_TVD_MIME_NO_HEADERS 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 BD194C433E6 for ; Tue, 5 Jan 2021 13:58:23 +0000 (UTC) Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6B1672073C for ; Tue, 5 Jan 2021 13:58:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B1672073C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bp.renesas.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=bounce+64572+6017+4520388+8129055@lists.cip-project.org X-Received: by 127.0.0.2 with SMTP id hrRPYY4521723xBFbb3qJkla; Tue, 05 Jan 2021 05:58:23 -0800 X-Received: from relmlie5.idc.renesas.com (relmlie5.idc.renesas.com []) by mx.groups.io with SMTP id smtpd.web11.5338.1609855082309757812 for ; Tue, 05 Jan 2021 05:58:22 -0800 X-IronPort-AV: E=Sophos;i="5.78,477,1599490800"; d="scan'208";a="68085845" X-Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 05 Jan 2021 22:58:22 +0900 X-Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 39CD54254F72; Tue, 5 Jan 2021 22:58:21 +0900 (JST) From: "Lad Prabhakar" To: cip-dev@lists.cip-project.org, Nobuhiro Iwamatsu , Pavel Machek Cc: Biju Das Subject: [cip-dev] [PATCH v3 4.19.y-cip 17/17] spi: rpc-if: Fix use-after-free on unbind Date: Tue, 5 Jan 2021 13:57:57 +0000 Message-Id: <20210105135757.11069-18-prabhakar.mahadev-lad.rj@bp.renesas.com> In-Reply-To: <20210105135757.11069-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20210105135757.11069-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: Bulk List-Unsubscribe: Sender: cip-dev@lists.cip-project.org List-Id: Mailing-List: list cip-dev@lists.cip-project.org; contact cip-dev+owner@lists.cip-project.org Reply-To: cip-dev@lists.cip-project.org X-Gm-Message-State: NJ9H2i0AvsqN33orTZDW0RKkx4520388AA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.cip-project.org; q=dns/txt; s=20140610; t=1609855103; bh=NESS4xu6RwjQ7Xqx4B7Mq3Xvmixido0KgF8bdbSStnw=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=qZEDHpzl17SdNbVk4taeJwKNeJu1BppTtoMDQCg3H4YRvVADdXIWeaiTBDrawNyrhgk Bpwkqn1COeeKzVQpArfzqkjZ0DdZ5rf/+qLo5dE9xUc7MhhxURa74Nu/hwjp1ni3dElE5 fo9DdxBQp3slIX9BUB8E/gUqg1bhqMF805A= From: Lukas Wunner commit 393f981ca5f797b58b882d42b7621fb6e43c7f5b upstream. rpcif_spi_remove() accesses the driver's private data after calling spi_unregister_controller() even though that function releases the last reference on the spi_controller and thereby frees the private data. Fix by switching over to the new devm_spi_alloc_master() helper which keeps the private data accessible until the driver has unbound. Fixes: eb8d6d464a27 ("spi: add Renesas RPC-IF driver") Signed-off-by: Lukas Wunner Cc: # v5.9+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation Cc: # v5.9+ Cc: Sergei Shtylyov Link: https://lore.kernel.org/r/c5da472c28021da2f6517441685cef033d40b140.1607286887.git.lukas@wunner.de Signed-off-by: Mark Brown Signed-off-by: Lad Prabhakar --- drivers/spi/spi-rpc-if.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/spi/spi-rpc-if.c b/drivers/spi/spi-rpc-if.c index ed3e548227f4..3579675485a5 100644 --- a/drivers/spi/spi-rpc-if.c +++ b/drivers/spi/spi-rpc-if.c @@ -134,7 +134,7 @@ static int rpcif_spi_probe(struct platform_device *pdev) struct rpcif *rpc; int error; - ctlr = spi_alloc_master(&pdev->dev, sizeof(*rpc)); + ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*rpc)); if (!ctlr) return -ENOMEM; @@ -159,13 +159,8 @@ static int rpcif_spi_probe(struct platform_device *pdev) error = spi_register_controller(ctlr); if (error) { dev_err(&pdev->dev, "spi_register_controller failed\n"); - goto err_put_ctlr; + rpcif_disable_rpm(rpc); } - return 0; - -err_put_ctlr: - rpcif_disable_rpm(rpc); - spi_controller_put(ctlr); return error; }