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=-18.7 required=3.0 tests=BAYES_00,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_RED, 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 B392CC433E0 for ; Mon, 28 Dec 2020 14:39:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 858F5207B2 for ; Mon, 28 Dec 2020 14:39:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2505704AbgL1OjO (ORCPT ); Mon, 28 Dec 2020 09:39:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:37682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503488AbgL1O35 (ORCPT ); Mon, 28 Dec 2020 09:29:57 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8326B221F0; Mon, 28 Dec 2020 14:29:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609165782; bh=2Bklf9DCJXUl3thJCI/qgi4JWKZUxw/j6HvbSQKMAW0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KBNRQEXoINT3MAJ9Tu6pt8E6aYCV26WykJ/fIWjFVLWT2mRQRSMBrDnkdnaHeXZR7 +iINHngTD5RVviaRQ6vhARw90vaWr7cgqHI97vBoBrQjyNcN0LO7xQ+3uC85FZ8dS0 FvYKoD/4QpfyMkD0DpBUanpoAQQyzkrkbCwbyTDo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lukas Wunner , Sergei Shtylyov , Mark Brown Subject: [PATCH 5.10 653/717] spi: rpc-if: Fix use-after-free on unbind Date: Mon, 28 Dec 2020 13:50:51 +0100 Message-Id: <20201228125052.229988513@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228125020.963311703@linuxfoundation.org> References: <20201228125020.963311703@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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: Greg Kroah-Hartman --- drivers/spi/spi-rpc-if.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) --- a/drivers/spi/spi-rpc-if.c +++ b/drivers/spi/spi-rpc-if.c @@ -134,7 +134,7 @@ static int rpcif_spi_probe(struct platfo 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 platfo 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; }