From patchwork Sat Jan 11 09:50:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 234135 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 2D602C33CA3 for ; Sat, 11 Jan 2020 10:11:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB29E20842 for ; Sat, 11 Jan 2020 10:11:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737481; bh=9GiLoNbMM/tBdB11IAaadoOkT3QvFpk8aTjuRVKEeDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yO/vIhxrGTW4yX5wicalo93oci9fi80BqjL55GXqKKbdn0Q9ya6KuY6QpQ541Y8+0 RDyo8og81Hg6BWckWXEaCMt7gIA/SwPjWQXx230DK0LoKGVkJ0Xn5zkXCd13FGHf5G J9Lf6spOgM5zu1cpeuZ3wN8MYzD0yD1GHzXkodNA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729583AbgAKKLU (ORCPT ); Sat, 11 Jan 2020 05:11:20 -0500 Received: from mail.kernel.org ([198.145.29.99]:48580 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729407AbgAKKLU (ORCPT ); Sat, 11 Jan 2020 05:11:20 -0500 Received: from localhost (unknown [62.119.166.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3F6F4206DA; Sat, 11 Jan 2020 10:11:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737479; bh=9GiLoNbMM/tBdB11IAaadoOkT3QvFpk8aTjuRVKEeDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RUmiyPJVzKLUjnX7rtXTE/GuS+AWWFquUFdQH5XaT7GREaqIIOV7ZoAAQ84+jb5sJ Un4bU78O50v350zP900KK+KCbM8jrQa/stDAGVC95nB7caBCiWfu4s48dmUsq4ZFRX YibjIhvTy4/iSPfBFxQy59gPaQRawYyFZ80UekN8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Kappner , Shawn Lin , Ulf Hansson , Jisheng Zhang Subject: [PATCH 4.14 46/62] mmc: core: Prevent bus reference leak in mmc_blk_init() Date: Sat, 11 Jan 2020 10:50:28 +0100 Message-Id: <20200111094851.228049308@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200111094837.425430968@linuxfoundation.org> References: <20200111094837.425430968@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alexander Kappner commit d0a0852b9f81cf5f793bf2eae7336ed40a1a1815 upstream. Upon module load, mmc_block allocates a bus with bus_registeri() in mmc_blk_init(). This reference never gets freed during module unload, which leads to subsequent re-insertions of the module fails and a WARN() splat is triggered. Fix the bug by dropping the reference for the bus in mmc_blk_exit(). Signed-off-by: Alexander Kappner Fixes: 97548575bef3 ("mmc: block: Convert RPMB to a character device") Cc: Reviewed-by: Shawn Lin Signed-off-by: Ulf Hansson Cc: Jisheng Zhang Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/core/block.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2904,6 +2904,7 @@ static void __exit mmc_blk_exit(void) mmc_unregister_driver(&mmc_driver); unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES); + bus_unregister(&mmc_rpmb_bus_type); } module_init(mmc_blk_init);