From patchwork Thu Apr 16 13:23:55 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: 227657 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=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 933EAC2BB55 for ; Thu, 16 Apr 2020 15:19:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6C6AF22241 for ; Thu, 16 Apr 2020 15:19:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587050362; bh=zIhIZGj24O1o982in8b2nseAv+Soag+2J7fvks+6GeU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OrOJ/FXk/XS0DFIYcqZLwFS+ou/uEsD5ruVmG+UJHEyaKkidNcIAalU6YOHeJmDCX oKC8zsc9T2f8xqABhhUBOKIS5Fk4jSWewp62l88KzkcA1a/DOY11u2XWT6hHNPf116 VWg+dJPR8mZjb4X+gMEvxVVDIoklE5xBkdvCN7i4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2442406AbgDPPTB (ORCPT ); Thu, 16 Apr 2020 11:19:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:34114 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390133AbgDPNsC (ORCPT ); Thu, 16 Apr 2020 09:48:02 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 BC8C72222C; Thu, 16 Apr 2020 13:48:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044882; bh=zIhIZGj24O1o982in8b2nseAv+Soag+2J7fvks+6GeU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xTUMgahuGmk2EneIrzIOwq4woo6zR/GXCsFfs8lM2+E6Tmx0mRb3QCE/hasMefqUo xlvnM+m53V0BxssjiHp0yLHas1L5EhtODf0aKdqhL/XQbKdWUw72f955UCKE/aUSKN PLFiwghXFxfXoQdYwiditmBwMUJXVw0JiWVWQ0zE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Qu Wenruo , Josef Bacik , David Sterba Subject: [PATCH 5.4 141/232] btrfs: drop block from cache on error in relocation Date: Thu, 16 Apr 2020 15:23:55 +0200 Message-Id: <20200416131332.620071433@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131316.640996080@linuxfoundation.org> References: <20200416131316.640996080@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: Josef Bacik commit 8e19c9732ad1d127b5575a10f4fbcacf740500ff upstream. If we have an error while building the backref tree in relocation we'll process all the pending edges and then free the node. However if we integrated some edges into the cache we'll lose our link to those edges by simply freeing this node, which means we'll leak memory and references to any roots that we've found. Instead we need to use remove_backref_node(), which walks through all of the edges that are still linked to this node and free's them up and drops any root references we may be holding. CC: stable@vger.kernel.org # 4.9+ Reviewed-by: Qu Wenruo Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/relocation.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -1186,7 +1186,7 @@ out: free_backref_node(cache, lower); } - free_backref_node(cache, node); + remove_backref_node(cache, node); return ERR_PTR(err); } ASSERT(!node || !node->detached);