From patchwork Tue Mar 24 12:31:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Taehee Yoo X-Patchwork-Id: 1260615 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=Axg7D1R2; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48mrFw1pjNz9sSM for ; Tue, 24 Mar 2020 23:31:16 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727611AbgCXMbN (ORCPT ); Tue, 24 Mar 2020 08:31:13 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:46717 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727256AbgCXMbM (ORCPT ); Tue, 24 Mar 2020 08:31:12 -0400 Received: by mail-pg1-f196.google.com with SMTP id k191so7800695pgc.13; Tue, 24 Mar 2020 05:31:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=D3JI0OQU8x2pwfGu19abKz8hfaV3ClUa1LRDR1fAqM4=; b=Axg7D1R2KMjDIo/ri9ExJCeHa7O6Y8Ex2bB17ohf5FrjppjNzZKUc/pnyIYXAsiafS RjXyoB7sQCg6b9x5xZdNCYlhREFsPTQsE9EBtM/LTSMtY1USWfGCQTyk96Q13t1uX41X 2WdkstyddM9tIrUUe7jzNcpTeVpOhO6YPGlRq0kL5XFxRFnQgEcRa+iE8pIbx44VcbUG dGq/mWozbThild/OnXL3cXXhapq9klN5YRs00waue2cgJcjpggJIOFKEu/cEueelV+m+ ubAheNEpg56Wq/K+FtSWL6p2HPVtn6KmFUrUdk48D0V8kTvkvwD+PupLRWRDGAY0crCH s7dg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=D3JI0OQU8x2pwfGu19abKz8hfaV3ClUa1LRDR1fAqM4=; b=DBmUbQNUyg7iwZ27sw2q6TYk+HMRWioaCzcpLIz/mCStFXuOemgY0UeMx4baGbSMZz Q3DJeOr5EBnEYykbRX0RKIdD9d5NCKxR09bXO7O0lcxrSBKItim6bQZURKGdYO9T8CSF yedcIIw3j/NlMkFDsNz7JWolifWIah28XfxFssQad0GKYwq7a20HZ+Y8aNH9hqgPMMc8 dy0WsvihpQdFM46v4RxYfLy70/pdx1PPUUiNjmjgRUQgLNRabGKVEhWy9Tg5qBU4Chos kJizS9bsA8wRM6UBf8c/ZLireQIho4gYTcEERdqT8c6N1LqoBFGxsageICereeFkv0KI 89vg== X-Gm-Message-State: ANhLgQ2WkysdRdIgD/9Y0z+n/kwzi/0bRjq+JFomBXRppg+vKco/yRg0 kXziKMGvnI09iOmRPzOVoUg= X-Google-Smtp-Source: ADFU+vuvazGxt+ZX6Sa6qam11zv/P2AlsEXxrsMv96eC/57mOzFSHAsbecN95nzF/nJ2FJfdR0s4lQ== X-Received: by 2002:a62:3147:: with SMTP id x68mr1584388pfx.62.1585053071672; Tue, 24 Mar 2020 05:31:11 -0700 (PDT) Received: from localhost.localdomain ([180.70.143.152]) by smtp.gmail.com with ESMTPSA id w6sm15959336pfw.55.2020.03.24.05.31.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2020 05:31:10 -0700 (PDT) From: Taehee Yoo To: davem@davemloft.net, kuba@kernel.org, gregkh@linuxfoundation.org, rafael@kernel.org, j.vosburgh@gmail.com, vfalico@gmail.com, andy@greyhouse.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: ap420073@gmail.com, mitch.a.williams@intel.com Subject: [PATCH net 2/3] net: core: add netdev_class_has_file_ns() helper function Date: Tue, 24 Mar 2020 12:31:04 +0000 Message-Id: <20200324123104.18983-1-ap420073@gmail.com> X-Mailer: git-send-email 2.17.1 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This helper function is to check whether the class file "/sys/class/net*" is existing or not. In the next patch, this helper function will be used. Reported-by: syzbot+830c6dbfc71edc4f0b8f@syzkaller.appspotmail.com Fixes: b76cdba9cdb2 ("[PATCH] bonding: add sysfs functionality to bonding (large)") Signed-off-by: Taehee Yoo --- include/linux/netdevice.h | 2 +- net/core/net-sysfs.c | 13 +++++++++++++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 6c3f7032e8d9..e32edca79e3a 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -4545,7 +4545,7 @@ int netdev_class_create_file_ns(const struct class_attribute *class_attr, const void *ns); void netdev_class_remove_file_ns(const struct class_attribute *class_attr, const void *ns); - +bool netdev_class_has_file_ns(const char *name, const void *ns); static inline int netdev_class_create_file(const struct class_attribute *class_attr) { return netdev_class_create_file_ns(class_attr, NULL); diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 4c826b8bf9b1..78de063201bc 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -1781,6 +1781,19 @@ void netdev_class_remove_file_ns(const struct class_attribute *class_attr, } EXPORT_SYMBOL(netdev_class_remove_file_ns); +bool netdev_class_has_file_ns(const char *name, const void *ns) +{ + struct kernfs_node *kn; + + kn = class_find_and_get_file_ns(&net_class, name, ns); + if (kn) { + kernfs_put(kn); + return true; + } + return false; +} +EXPORT_SYMBOL(netdev_class_has_file_ns); + int __init netdev_kobject_init(void) { kobj_ns_type_register(&net_ns_type_operations);