From patchwork Tue Mar 24 12:30:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Taehee Yoo X-Patchwork-Id: 1260614 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=rjcQwrEE; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48mrFh4J2Cz9sSM for ; Tue, 24 Mar 2020 23:31:04 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727580AbgCXMbC (ORCPT ); Tue, 24 Mar 2020 08:31:02 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:38084 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727256AbgCXMbB (ORCPT ); Tue, 24 Mar 2020 08:31:01 -0400 Received: by mail-pf1-f195.google.com with SMTP id z25so4867447pfa.5; Tue, 24 Mar 2020 05:31:00 -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=rjcQwrEEwd38HKXiiRHyTNtX0owKMWahas2q3bAKpZ1vIA4OUp3hbVUqW1LGfxqMZr erGnJNkhR3tAMGTxniU/ZRotGBQvYFEQEFFDqSzeUTi0ZszrjcoraZE5ZTxWCYUZTmaY I8B9Htzw5eYOpCrniauwt4bO7n72EQtSYl9GjjcCR/KvuI0vLJZiIIQ/9fO5bOZnby0g 3xnh2OnRis2zvZvVO/eeX59k5mwLZhLkV7EZbngbRoTb4nYOi1d8u18WdzfUd5z1KNKd yCWqU799wMfom4lGqpgo+ycYYv+YBAhE5C0/KiK2sKK5rc/0Rln9FPd61TFroyHQZ7mP hEwA== 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=l+KECkUuPi4c2AZw+tTQFF2RQYogbCY9wT6x2OCmwjcnFmZtrQv6daOS30OsuCAGFU 5g68YZXGatUA+WWJBRiroROeFUcLioAH/VvViYxDdOhs/GmwX3pf+I29EVlI3o6scphE AL+5h4EleqsK+B7OlBzwDt3UNZJmR41A6wgTdRjnIkOUuDv2mqN2cmaHlmg6wp4V528E WPw/QS+/V9GSnO94OUStqod7eOivY/H9i0gh3MtsGi4NsxJ2o9wOabIoUb3WDyh+9dWk 7Qwr6FVBvfXCGC4VGn3bNQSigtDsk0/4PmxTpNpC4Ofg9oouYHwGc3b6G5AdjgsLitNN zHTg== X-Gm-Message-State: ANhLgQ34aae9IL2Kf4KSIHzObJM2rQ8oICtr8IoHxPBvqnwoNDLJOprm l3PwFph2isHec2myixGwdyA= X-Google-Smtp-Source: ADFU+vvf33TJmQrGUFdzHUfRsPxkmjO7EFt1Uq5CQXRJ7pqbjC9tsRCv1U6/9456hIJojqhMXy9JPA== X-Received: by 2002:a63:fd0d:: with SMTP id d13mr23986197pgh.302.1585053059651; Tue, 24 Mar 2020 05:30:59 -0700 (PDT) Received: from localhost.localdomain ([180.70.143.152]) by smtp.gmail.com with ESMTPSA id v26sm2966546pfn.51.2020.03.24.05.30.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2020 05:30:58 -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 1/3] class: add class_find_and_get_file_ns() helper function Date: Tue, 24 Mar 2020 12:30:52 +0000 Message-Id: <20200324123052.18904-1-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) {