From patchwork Sun Feb 23 11:22:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Madhuparna Bhowmik X-Patchwork-Id: 1242638 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=uuOFmCqu; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48QNBp6chcz9sRN for ; Sun, 23 Feb 2020 22:24:34 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727258AbgBWLWn (ORCPT ); Sun, 23 Feb 2020 06:22:43 -0500 Received: from mail-pf1-f194.google.com ([209.85.210.194]:36118 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726236AbgBWLWm (ORCPT ); Sun, 23 Feb 2020 06:22:42 -0500 Received: by mail-pf1-f194.google.com with SMTP id 185so3784862pfv.3; Sun, 23 Feb 2020 03:22:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=sN5H5uRLxodeA5ftMsFKjGciLDtvEDOcbHLiiCvT97A=; b=uuOFmCqu1d9sfG86Qiyc9owige0Ou0kvZAf7Aloq6yU5Vs9Jlp+tPaOTsRCcUfJhGv WF2zjCuWOg3RVOe+XDokcsT4rBZyHm7gMWSrS1xYkHaRLFlpxtjW1JbdrslewMQRcddP vaOUjmx5cMva+W5QjX9cNqHMZ1KGYYum6ncoZz+hGhS9J+X4a5zJroahnMULLMNwh6xZ z/Il2UJV4GzTC8L9RTzNNxNNy5F7wyTsi724lok/8K5gM/TnhGMkJzRaluxAr9GAQgyS 7vFmi5vd8UJ4iEHPNQrjMIcQEx1C6QU4jh3eCKHcgfUyMyeqQ9PkqvgCBxbEnZ2nJpHJ ZFYQ== 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=sN5H5uRLxodeA5ftMsFKjGciLDtvEDOcbHLiiCvT97A=; b=Qshy3r8q02w75WDT3pdaGJCRkZpNed5PVn++l08w2wvb5HMJeaHA4BAww4dSKWFLlX apevnZtrnih8hQGkx5rRywTGO5SQuFBV8R6tkkKNb0Iyb3VZe1r4/R/dW956PD1yAMXO 3sL38Q42Ng677Yq1eUhmIpSP+wD5sVVY//EQJalbU+toDf/HsmJipJ18sCB3dGpV8AjR S6vJv6CZYRwaBHZYUIhHgHcV6bZQaZxpX0y8ei/P5AAgqMGidyEXNp6DvzL5EqwI3AJD Y2Hg/RMPDGHm4BNuTVR8Eb0V+llfC6scay5BhNPR9IIXTF3NIY2ry7CCGIao5aDn8+RV adbw== X-Gm-Message-State: APjAAAVRzzHKQc/adL69mm7ntY36EzSgojIW9B3XdU8fnSdgt42p+8f4 a3A7u1N9TVP0LTRTsGtneg== X-Google-Smtp-Source: APXvYqzFWkFdZrObvg5gTMa7MV1O7ZL7rM1c9JISPyZ95Uyl7uXVnez3GO1zSfXywPpVHNl48+/+8A== X-Received: by 2002:a63:ec07:: with SMTP id j7mr47290312pgh.187.1582456960948; Sun, 23 Feb 2020 03:22:40 -0800 (PST) Received: from madhuparna-HP-Notebook.nitk.ac.in ([2402:3a80:515:9a49:e8ed:fa6e:a613:7ebf]) by smtp.gmail.com with ESMTPSA id j8sm8641078pjb.4.2020.02.23.03.22.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Feb 2020 03:22:40 -0800 (PST) From: madhuparnabhowmik10@gmail.com To: jiri@mellanox.com, davem@davemloft.net Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, joel@joelfernandes.org, linux-kernel-mentees@lists.linuxfoundation.org, paulmck@kernel.org, Madhuparna Bhowmik Subject: [PATCH] net: core: devlink.c: Hold devlink->lock from the beginning of devlink_dpipe_table_register() Date: Sun, 23 Feb 2020 16:52:33 +0530 Message-Id: <20200223112233.13417-1-madhuparnabhowmik10@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 From: Madhuparna Bhowmik devlink_dpipe_table_find() should be called under either rcu_read_lock() or devlink->lock. devlink_dpipe_table_register() calls devlink_dpipe_table_find() without holding the lock and acquires it later. Therefore hold the devlink->lock from the beginning of devlink_dpipe_table_register(). Suggested-by: Jiri Pirko Signed-off-by: Madhuparna Bhowmik Reviewed-by: Jiri Pirko --- net/core/devlink.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/net/core/devlink.c b/net/core/devlink.c index 4c63c9a4c09e..e82750bdc496 100644 --- a/net/core/devlink.c +++ b/net/core/devlink.c @@ -6838,26 +6838,33 @@ int devlink_dpipe_table_register(struct devlink *devlink, void *priv, bool counter_control_extern) { struct devlink_dpipe_table *table; - - if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) - return -EEXIST; + int err = 0; if (WARN_ON(!table_ops->size_get)) return -EINVAL; + mutex_lock(&devlink->lock); + + if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) { + err = -EEXIST; + goto unlock; + } + table = kzalloc(sizeof(*table), GFP_KERNEL); - if (!table) - return -ENOMEM; + if (!table) { + err = -ENOMEM; + goto unlock; + } table->name = table_name; table->table_ops = table_ops; table->priv = priv; table->counter_control_extern = counter_control_extern; - mutex_lock(&devlink->lock); list_add_tail_rcu(&table->list, &devlink->dpipe_table_list); +unlock: mutex_unlock(&devlink->lock); - return 0; + return err; } EXPORT_SYMBOL_GPL(devlink_dpipe_table_register);