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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 C2C03C433DF for ; Thu, 20 Aug 2020 11:40:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 97F37204EA for ; Thu, 20 Aug 2020 11:40:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597923649; bh=c/xRijeuzODAqaNygQBo2j0jwY8iEWDll5Co5J4/6i4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Cqq+tSUCdUEmo4HtGmyRSn2xrSuGywJasYJXar0gIf+BGvyELz7ODvnysRjD8asuE Vp0m9z3U4wQ4JQc5zXjAR9++UKnaQwTNjnug2qzFzRY6DdCelwHX3fzwqUJHbPEgJX LT3TnrgL2IDirboxk6SZIX/uFwk/jQZwqe706UTY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730551AbgHTLkr (ORCPT ); Thu, 20 Aug 2020 07:40:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:60170 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729149AbgHTKFC (ORCPT ); Thu, 20 Aug 2020 06:05:02 -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 B43B822B4E; Thu, 20 Aug 2020 10:05:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917902; bh=c/xRijeuzODAqaNygQBo2j0jwY8iEWDll5Co5J4/6i4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bb3Reihj81PFLKykUnXuRaA18UxJPTf4QiVNNfs5g9uFH/QoAmAsP8AGw1WtRlz7t jSvQz70Q64pfTOn0N8zS6yAIWgp7CROZtwGailmrwViAM0apbZWnMdUh/64KqyPGbS +tbaTfOeCdjTRvnXhKKkb3rfeXHsh7PKw4jB4hVM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Juergen Gross Subject: [PATCH 4.9 167/212] xen/balloon: fix accounting in alloc_xenballooned_pages error path Date: Thu, 20 Aug 2020 11:22:20 +0200 Message-Id: <20200820091610.832256287@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Roger Pau Monne commit 1951fa33ec259abdf3497bfee7b63e7ddbb1a394 upstream. target_unpopulated is incremented with nr_pages at the start of the function, but the call to free_xenballooned_pages will only subtract pgno number of pages, and thus the rest need to be subtracted before returning or else accounting will be skewed. Signed-off-by: Roger Pau Monné Reviewed-by: Juergen Gross Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200727091342.52325-2-roger.pau@citrix.com Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman --- drivers/xen/balloon.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -694,6 +694,12 @@ int alloc_xenballooned_pages(int nr_page out_undo: mutex_unlock(&balloon_mutex); free_xenballooned_pages(pgno, pages); + /* + * NB: free_xenballooned_pages will only subtract pgno pages, but since + * target_unpopulated is incremented with nr_pages at the start we need + * to remove the remaining ones also, or accounting will be screwed. + */ + balloon_stats.target_unpopulated -= nr_pages - pgno; return ret; } EXPORT_SYMBOL(alloc_xenballooned_pages);