From nobody Sun Feb 8 14:22:35 2026 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 03150C6FD1C for ; Thu, 23 Mar 2023 02:51:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229819AbjCWCvJ (ORCPT ); Wed, 22 Mar 2023 22:51:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41396 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229496AbjCWCvH (ORCPT ); Wed, 22 Mar 2023 22:51:07 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3CCF1F5F7 for ; Wed, 22 Mar 2023 19:50:40 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id u5so21044413plq.7 for ; Wed, 22 Mar 2023 19:50:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1679539840; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=sevPZAbnJXpK9Gw6YJPfGdmbozGF7BL49NEd8f9V3sk=; b=K5LxBdjOseL5I6aPTCQj7mHOFrhSOsgr2H7aLFrf3+iTBz1SkiH4drMDXKHspvKHh8 ir6NY0BHV8wzZRqr650A4n50Ym2RANG1n/zMZhHfw7eDFqvxaybOS0tVKj0afXgNNty9 4FkQ8U5F3eCHQg/1XCLNrw77GyKdkYgfi4r9pgVAEyeBxxM+bt9vHBOMTtMEbSs8teuK KvYZC+jMljwWjA9ITNIU24u2lrxtVOMULqQ2rOQty9YzonegtQUwUxSKSZ07f4Zcr9re iqLoFVUKUtCzpZ38vrKLQtjm/ugteQnfeZYWuFaFk3YzeHWXPCPI4gd3uwg85IcIWht4 /Cxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679539840; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=sevPZAbnJXpK9Gw6YJPfGdmbozGF7BL49NEd8f9V3sk=; b=0iGy9rYeIz2CTT0UFNhPMxpD0wb3H26Bd07FXDx2Vs/Yst1WWJ9VJxYFCXS5FAwpsi ZZUO5AziSrIHJvdINDXYGG4NTtST0xVh2H/y7lAbBU4Sm1PIW9iRq8ybFt8wZFhr0MWU IJApMgGFSCfBzjchWZJnYYjSf956ts7xBwjW42ynHj7LxUe/npvlWu9iB10wyEUPrqBd L6XswAd0R8NMlDynbqJxXDmYsKkwzVMBtoiW7lXQXkX49vnokmDhMdcoqLzFxoJjUQt5 GAU5ZCPVRSQoEquuC8MRmGdQhLH9IvP/iZL1pNV+P/IU1s7HGmmcx/012SRZJpKW3S1b AwJA== X-Gm-Message-State: AO0yUKUc2HW1Iv7TnjnBxkjyK9g4IrblgdXrAuxOt2BiLK3QMTRnuzQi UDCbConzLqyQjV+KqLYz4lFPcA== X-Google-Smtp-Source: AK7set9U4IRnF/3MjkmcN7a8fucFYk3GEpd0H73YEk0MoZDAs7wkYLfugtcMCG/5Ztti3TGfqLA+og== X-Received: by 2002:a17:90b:17cb:b0:23f:5fe7:25a1 with SMTP id me11-20020a17090b17cb00b0023f5fe725a1mr6179466pjb.13.1679539840378; Wed, 22 Mar 2023 19:50:40 -0700 (PDT) Received: from PXLDJ45XCM.bytedance.net ([61.213.176.5]) by smtp.gmail.com with ESMTPSA id h7-20020a17090a2ec700b0023b5528b8d4sm221002pjs.19.2023.03.22.19.50.35 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 22 Mar 2023 19:50:39 -0700 (PDT) From: Muchun Song To: glider@google.com, elver@google.com, dvyukov@google.com, akpm@linux-foundation.org, jannh@google.com, sjpark@amazon.de, muchun.song@linux.dev Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song Subject: [PATCH] mm: kfence: fix handling discontiguous page Date: Thu, 23 Mar 2023 10:50:03 +0800 Message-Id: <20230323025003.94447-1-songmuchun@bytedance.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The struct pages could be discontiguous when the kfence pool is allocated via alloc_contig_pages() with CONFIG_SPARSEMEM and !CONFIG_SPARSEMEM_VMEMMA= P. So, the iteration should use nth_page(). Fixes: 0ce20dd84089 ("mm: add Kernel Electric-Fence infrastructure") Signed-off-by: Muchun Song Reviewed-by: Kefeng Wang Reviewed-by: Marco Elver --- mm/kfence/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/kfence/core.c b/mm/kfence/core.c index d66092dd187c..1065e0568d05 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -556,7 +556,7 @@ static unsigned long kfence_init_pool(void) * enters __slab_free() slow-path. */ for (i =3D 0; i < KFENCE_POOL_SIZE / PAGE_SIZE; i++) { - struct slab *slab =3D page_slab(&pages[i]); + struct slab *slab =3D page_slab(nth_page(pages, i)); =20 if (!i || (i % 2)) continue; @@ -602,7 +602,7 @@ static unsigned long kfence_init_pool(void) =20 reset_slab: for (i =3D 0; i < KFENCE_POOL_SIZE / PAGE_SIZE; i++) { - struct slab *slab =3D page_slab(&pages[i]); + struct slab *slab =3D page_slab(nth_page(pages, i)); =20 if (!i || (i % 2)) continue; --=20 2.11.0