From patchwork Tue Mar 24 14:17:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Taehee Yoo X-Patchwork-Id: 1260704 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=i+R3w8ty; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48mtcc52Hvz9sT3 for ; Wed, 25 Mar 2020 01:17:36 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727553AbgCXORd (ORCPT ); Tue, 24 Mar 2020 10:17:33 -0400 Received: from mail-pj1-f65.google.com ([209.85.216.65]:55158 "EHLO mail-pj1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727282AbgCXORd (ORCPT ); Tue, 24 Mar 2020 10:17:33 -0400 Received: by mail-pj1-f65.google.com with SMTP id np9so1543413pjb.4; Tue, 24 Mar 2020 07:17:32 -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=nqAcdWRnqSA/uVQmjWL4caKhzvHsEqccflrG15Mc1BU=; b=i+R3w8tyBBRz7DPLdorBhqwkmJr0che8ngK6INjQt9Dj6plsw9cPLB9/2oL+Ru2Phu EJ1NEWAtawVzsfxWiDf6mPWQ2QVA6l74wvA1wYnt8AuOHHJ9XcQEv4KXa9BnlsrTp7xP X7Y3+pHhYiIBwCbGIVt25dnRGWiYKM0D244lbl7iwbmLPU5XCzvOtJukJXN8MTRcHN0f ypa56lPmgFOS1rviBKXsY3G2+GeKCmst6Wfh2ISNAGqLtX8JEL2BDKa0+BM8onFimw3g Lf7ARAbwGniGWHYWllahoFtg/Ds90+rhgRNTrQ2GceBy5sV18StFxyCic0gb6e49Y1Sz boBw== 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=nqAcdWRnqSA/uVQmjWL4caKhzvHsEqccflrG15Mc1BU=; b=BwgWn8j1eN/y6D31AyQ9y5X3rsL1fFbyNgd+YKmjLlxjXQBW1L1E8D43YAIcVweoXN eaz8EFYpm7Dl9ui8WuM7jSV+a5igU8SNFEg58/IfvTqz2VDKVF96M28Eb/Cx3wGc/1UN aJba6fNk5ldPZ+cBZtZ2p55VDY4mq8g/U4Ae4cSGq62+di5Im8pCp6OOFRo3EHkvAsv6 2lJmIesdPSQBnFcXU3MT0VxIQG93c8RAhT2sGrSBD2qHIc9hnlVmDdHbA/8+K2jq/po8 63C2ZGNuUYs6l7oZQcVsVV+cE9ZFw8YvkmndmSRRdwVC53MIuRSXzGiK/EY1NjXUbhxN MgbA== X-Gm-Message-State: ANhLgQ24GKiNGMobF5Wl+GZEg7/dOGsqZ7N7JNp126wDtJIMcK0eZCek fQBxMqUsplhltiCTxCmgy/Q= X-Google-Smtp-Source: ADFU+vvCSoe1U89aWWTI8mNMwOh7QdhrRFV/bChepi0T+tjxcwIiOwaHnOhN/sgcgKEl4/URYv0CGQ== X-Received: by 2002:a17:902:7248:: with SMTP id c8mr12760121pll.243.1585059451710; Tue, 24 Mar 2020 07:17:31 -0700 (PDT) Received: from localhost.localdomain ([180.70.143.152]) by smtp.gmail.com with ESMTPSA id y3sm16256642pfy.158.2020.03.24.07.17.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2020 07:17:30 -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 RESEND net 1/3] class: add class_find_and_get_file_ns() helper function Date: Tue, 24 Mar 2020 14:17:22 +0000 Message-Id: <20200324141722.21308-1-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 The new helper function is to find and get a class file. This function is useful for checking whether the class file is existing or not. This function will be used by networking stack to check "/sys/class/net/*" file. Reported-by: syzbot+830c6dbfc71edc4f0b8f@syzkaller.appspotmail.com Fixes: b76cdba9cdb2 ("[PATCH] bonding: add sysfs functionality to bonding (large)") Signed-off-by: Taehee Yoo --- drivers/base/class.c | 12 ++++++++++++ include/linux/device/class.h | 4 +++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/base/class.c b/drivers/base/class.c index bcd410e6d70a..dedf41f32f0d 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -105,6 +105,17 @@ void class_remove_file_ns(struct class *cls, const struct class_attribute *attr, sysfs_remove_file_ns(&cls->p->subsys.kobj, &attr->attr, ns); } +struct kernfs_node *class_find_and_get_file_ns(struct class *cls, + const char *name, + const void *ns) +{ + struct kernfs_node *kn = NULL; + + if (cls) + kn = kernfs_find_and_get_ns(cls->p->subsys.kobj.sd, name, ns); + return kn; +} + static struct class *class_get(struct class *cls) { if (cls) @@ -580,6 +591,7 @@ int __init classes_init(void) EXPORT_SYMBOL_GPL(class_create_file_ns); EXPORT_SYMBOL_GPL(class_remove_file_ns); +EXPORT_SYMBOL_GPL(class_find_and_get_file_ns); EXPORT_SYMBOL_GPL(class_unregister); EXPORT_SYMBOL_GPL(class_destroy); diff --git a/include/linux/device/class.h b/include/linux/device/class.h index e8d470c457d1..230cf2ce6d3f 100644 --- a/include/linux/device/class.h +++ b/include/linux/device/class.h @@ -209,7 +209,9 @@ extern int __must_check class_create_file_ns(struct class *class, extern void class_remove_file_ns(struct class *class, const struct class_attribute *attr, const void *ns); - +struct kernfs_node *class_find_and_get_file_ns(struct class *cls, + const char *name, + const void *ns); static inline int __must_check class_create_file(struct class *class, const struct class_attribute *attr) {