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,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 DDA74C433E1 for ; Mon, 17 Aug 2020 17:22:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5BED20657 for ; Mon, 17 Aug 2020 17:22:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597684929; bh=AeWOSZs2Ggfl1t1WNA/c3wR5SFzllGTVFS/NVXtR+ow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=PQAVaVGiVkvrOr3dkYCP6s6+tyfeAPagweHoDHRhn99x0pn7hGpG3kGwcbK4koixR H3KEUICrH4dLGUcGtefOV5oTgBEC/vdyLMmEEFa0i7ML4uMzBP6vSSNSaaE8/ikHsA auQByA+AaGV5Lm9ugawgPLztDeKDMJdns8aQbFh8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731465AbgHQRWE (ORCPT ); Mon, 17 Aug 2020 13:22:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:56732 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731139AbgHQQSB (ORCPT ); Mon, 17 Aug 2020 12:18:01 -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 B3322207FB; Mon, 17 Aug 2020 16:17:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597681080; bh=AeWOSZs2Ggfl1t1WNA/c3wR5SFzllGTVFS/NVXtR+ow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lWsAAnSJMclLadHb4sLLTJtuE2fVlOF0tBeu34x580tm2fM/bPCDibb1558F8sGJP BLIqMMtTvMcI9iyWD06XLP4cAW9IAjShJiJSB8tYD3RTJ/80OpHFt5YEYgwZ3P10oh y1hpYn4CEREyy7kFX/w4JVBPBRWmHh28Ck1NaUSg= 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 4.19 166/168] xen/balloon: fix accounting in alloc_xenballooned_pages error path Date: Mon, 17 Aug 2020 17:18:17 +0200 Message-Id: <20200817143741.956665749@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200817143733.692105228@linuxfoundation.org> References: <20200817143733.692105228@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 @@ -632,6 +632,12 @@ 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);