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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4C52C433FE for ; Wed, 2 Nov 2022 03:36:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231230AbiKBDgh (ORCPT ); Tue, 1 Nov 2022 23:36:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230364AbiKBDgg (ORCPT ); Tue, 1 Nov 2022 23:36:36 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B54626541 for ; Tue, 1 Nov 2022 20:36:35 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 92988B82063 for ; Wed, 2 Nov 2022 03:36:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B847C433D6; Wed, 2 Nov 2022 03:36:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667360192; bh=4MDeUX9zXGuKwdru4RSYc2GsBf2ukdN4kUYOT0uptiE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L9sAyrQWRhymqfCl/DKkSKWmsquXgsmmdXzeZ5fjQ0omtq73PMaeB13pb2wCmYzy+ 3ZmX1Ob0QgeyzlWQOOPqjO61Y6b7wDtC6y2dw9B0VH0mi0Jdsd1Gn3XqheDXlSKU+G VFfcj+dXD4WTkhF6tsG+1D+KKPYVB8MC/RxnLlWU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Rik van Riel , Mike Kravetz , Naoya Horiguchi , Glen McCready , Muchun Song , Andrew Morton Subject: [PATCH 4.19 47/78] mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages Date: Wed, 2 Nov 2022 03:34:32 +0100 Message-Id: <20221102022054.371007992@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221102022052.895556444@linuxfoundation.org> References: <20221102022052.895556444@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Rik van Riel commit 12df140f0bdfae5dcfc81800970dd7f6f632e00c upstream. The h->*_huge_pages counters are protected by the hugetlb_lock, but alloc_huge_page has a corner case where it can decrement the counter outside of the lock. This could lead to a corrupted value of h->resv_huge_pages, which we have observed on our systems. Take the hugetlb_lock before decrementing h->resv_huge_pages to avoid a potential race. Link: https://lkml.kernel.org/r/20221017202505.0e6a4fcd@imladris.surriel.com Fixes: a88c76954804 ("mm: hugetlb: fix hugepage memory leak caused by wrong reserve count") Signed-off-by: Rik van Riel Reviewed-by: Mike Kravetz Cc: Naoya Horiguchi Cc: Glen McCready Cc: Mike Kravetz Cc: Muchun Song Cc: Signed-off-by: Andrew Morton Signed-off-by: Mike Kravetz Signed-off-by: Greg Kroah-Hartman --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2116,11 +2116,11 @@ struct page *alloc_huge_page(struct vm_a page = alloc_buddy_huge_page_with_mpol(h, vma, addr); if (!page) goto out_uncharge_cgroup; + spin_lock(&hugetlb_lock); if (!avoid_reserve && vma_has_reserves(vma, gbl_chg)) { SetPagePrivate(page); h->resv_huge_pages--; } - spin_lock(&hugetlb_lock); list_move(&page->lru, &h->hugepage_activelist); /* Fall through */ }