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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4488BC433EF for ; Sun, 24 Oct 2021 11:53:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E65561002 for ; Sun, 24 Oct 2021 11:53:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230355AbhJXLzz (ORCPT ); Sun, 24 Oct 2021 07:55:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:59698 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229867AbhJXLzy (ORCPT ); Sun, 24 Oct 2021 07:55:54 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AFC4260EBD; Sun, 24 Oct 2021 11:53:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1635076414; bh=xFTl1FaNN8PW90boVgFgGtwSBxzb1R7y79iONkzR69Y=; h=Subject:To:Cc:From:Date:From; b=Jh23x8NG6aHGiFAEB1nhjOery/KMCjgmQSGGIzb4SDMl6VGUEpZPpOv/hIGie2Gbq jaq2H66apZg3gUleBxUlKQ33hBtWfX8J90LOpWanNlMCK3Z+qn2tRsqbLh28QN0AWr fIBhsQt05YKXigRqO2rnj9fzJWpD4MQOhrMsoa1I= Subject: FAILED: patch "[PATCH] mm, slub: fix two bugs in slab_debug_trace_open()" failed to apply to 5.14-stable tree To: linmiaohe@huawei.com, akpm@linux-foundation.org, andreyknvl@gmail.com, bharata@linux.ibm.com, cl@linux.com, faiyazm@codeaurora.org, gregkh@linuxfoundation.org, guro@fb.com, iamjoonsoo.kim@lge.com, keescook@chromium.org, penberg@kernel.org, rientjes@google.com, ryabinin.a.a@gmail.com, stable@vger.kernel.org, torvalds@linux-foundation.org, vbabka@suse.cz Cc: From: Date: Sun, 24 Oct 2021 13:53:32 +0200 Message-ID: <163507641218149@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 2127d22509aec3a83dffb2a3c736df7ba747a7ce Mon Sep 17 00:00:00 2001 From: Miaohe Lin Date: Mon, 18 Oct 2021 15:15:52 -0700 Subject: [PATCH] mm, slub: fix two bugs in slab_debug_trace_open() Patch series "Fixups for slub". This series contains various bug fixes for slub. We fix memoryleak, use-afer-free, NULL pointer dereferencing and so on in slub. More details can be found in the respective changelogs. This patch (of 5): It's possible that __seq_open_private() will return NULL. So we should check it before using lest dereferencing NULL pointer. And in error paths, we forgot to release private buffer via seq_release_private(). Memory will leak in these paths. Link: https://lkml.kernel.org/r/20210916123920.48704-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20210916123920.48704-2-linmiaohe@huawei.com Fixes: 64dd68497be7 ("mm: slub: move sysfs slab alloc/free interfaces to debugfs") Signed-off-by: Miaohe Lin Reviewed-by: Vlastimil Babka Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Greg Kroah-Hartman Cc: Faiyaz Mohammed Cc: Andrey Konovalov Cc: Andrey Ryabinin Cc: Kees Cook Cc: Bharata B Rao Cc: Roman Gushchin Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds diff --git a/mm/slub.c b/mm/slub.c index 3d2025f7163b..ed160b6c54f8 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -6108,9 +6108,14 @@ static int slab_debug_trace_open(struct inode *inode, struct file *filep) struct kmem_cache *s = file_inode(filep)->i_private; unsigned long *obj_map; + if (!t) + return -ENOMEM; + obj_map = bitmap_alloc(oo_objects(s->oo), GFP_KERNEL); - if (!obj_map) + if (!obj_map) { + seq_release_private(inode, filep); return -ENOMEM; + } if (strcmp(filep->f_path.dentry->d_name.name, "alloc_traces") == 0) alloc = TRACK_ALLOC; @@ -6119,6 +6124,7 @@ static int slab_debug_trace_open(struct inode *inode, struct file *filep) if (!alloc_loc_track(t, PAGE_SIZE / sizeof(struct location), GFP_KERNEL)) { bitmap_free(obj_map); + seq_release_private(inode, filep); return -ENOMEM; }