From nobody Tue Apr 7 05:47:52 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 0EB5BECAAA1 for ; Tue, 30 Aug 2022 14:10:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230081AbiH3OKZ (ORCPT ); Tue, 30 Aug 2022 10:10:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229541AbiH3OKW (ORCPT ); Tue, 30 Aug 2022 10:10:22 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E83E2AE2B for ; Tue, 30 Aug 2022 07:10:19 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 1B27F61511 for ; Tue, 30 Aug 2022 14:10:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50062C433D6; Tue, 30 Aug 2022 14:10:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661868618; bh=9jvmfxVkEDEXTF+mMxMl1gFBBTusiLQ4TP5tx3/ow2U=; h=From:To:Cc:Subject:Date:From; b=LL8l90mImhJxlaekcy63LJKtXNiuQGiW07yMVKoDLBIxRsgypBjk4hR8aa68GeNqW JL2J643sZgxkKO+YA4QXeeAfI6bpib4bt+KBbQDaYV/PsYEaazCt0aHe0U7Tnp9NTz KKT/LyE1kHkdyxbsj0xqX6d4rvVUY+l+dVBHwnz+UyUyud9W6wPFX5iZkQFo+HqLGC KdDQVWp+yUk4niFGNfQM+O9Tosd4sGX1izEVdjH0MHSkEz0F9XSr9aeVrXqc5Ybni0 ckdggUJDG5WTnT4B5GYA0qtEI1rzVdyMimGz2fMu1lEC6hCHebBSJNsLq4veI+dqmm bl9gtp0ry5YTQ== From: Chao Yu To: linux-mm@kvack.org Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, chao@kernel.org, jaegeuk@kernel.org, Chao Yu , stable@kernel.org, syzbot+81684812ea68216e08c5@syzkaller.appspotmail.com Subject: [PATCH] mm/slub: fix to return errno if kmalloc() fails Date: Tue, 30 Aug 2022 22:10:09 +0800 Message-Id: <20220830141009.150075-1-chao@kernel.org> X-Mailer: git-send-email 2.25.1 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" From: Chao Yu In create_unique_id(), kmalloc(, GFP_KERNEL) can fail due to out-of-memory, if it fails, return errno correctly rather than triggering panic via BUG_ON(); kernel BUG at mm/slub.c:5893! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP Call trace: sysfs_slab_add+0x258/0x260 mm/slub.c:5973 __kmem_cache_create+0x60/0x118 mm/slub.c:4899 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x19c/0x31c mm/slab_common.c:335 kmem_cache_create+0x1c/0x28 mm/slab_common.c:390 f2fs_kmem_cache_create fs/f2fs/f2fs.h:2766 [inline] f2fs_init_xattr_caches+0x78/0xb4 fs/f2fs/xattr.c:808 f2fs_fill_super+0x1050/0x1e0c fs/f2fs/super.c:4149 mount_bdev+0x1b8/0x210 fs/super.c:1400 f2fs_mount+0x44/0x58 fs/f2fs/super.c:4512 legacy_get_tree+0x30/0x74 fs/fs_context.c:610 vfs_get_tree+0x40/0x140 fs/super.c:1530 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 path_mount+0x358/0x914 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x2f8/0x408 fs/namespace.c:3568 Cc: Reported-by: syzbot+81684812ea68216e08c5@syzkaller.appspotmail.com Signed-off-by: Chao Yu Acked-by: David Rientjes Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Muchun Song --- mm/slub.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index 862dbd9af4f5..e6f3727b9ad2 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -5890,7 +5890,8 @@ static char *create_unique_id(struct kmem_cache *s) char *name =3D kmalloc(ID_STR_LENGTH, GFP_KERNEL); char *p =3D name; =20 - BUG_ON(!name); + if (!name) + return ERR_PTR(-ENOMEM); =20 *p++ =3D ':'; /* @@ -5948,6 +5949,8 @@ static int sysfs_slab_add(struct kmem_cache *s) * for the symlinks. */ name =3D create_unique_id(s); + if (IS_ERR(name)) + return PTR_ERR(name); } =20 s->kobj.kset =3D kset; --=20 2.25.1