From mboxrd@z Thu Jan 1 00:00:00 1970 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 A6A26C4332F for ; Fri, 6 May 2022 01:42:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1388147AbiEFBqK (ORCPT ); Thu, 5 May 2022 21:46:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1388169AbiEFBps (ORCPT ); Thu, 5 May 2022 21:45:48 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 250715E759; Thu, 5 May 2022 18:41:39 -0700 (PDT) Received: from kwepemi100020.china.huawei.com (unknown [172.30.72.56]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4KvYDJ36N6z1JBs2; Fri, 6 May 2022 09:40:32 +0800 (CST) Received: from kwepemm600017.china.huawei.com (7.193.23.234) by kwepemi100020.china.huawei.com (7.221.188.48) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 6 May 2022 09:41:37 +0800 Received: from localhost.localdomain (10.175.112.125) by kwepemm600017.china.huawei.com (7.193.23.234) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 6 May 2022 09:41:35 +0800 From: Peng Liu To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH 2/2] null_blk: fix wrong use of nr_online_nodes Date: Fri, 6 May 2022 01:58:01 +0000 Message-ID: <20220506015801.757918-3-liupeng256@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220506015801.757918-1-liupeng256@huawei.com> References: <20220506015801.757918-1-liupeng256@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Certain systems are designed to have sparse/discontiguous nodes, a valid node may be greater than nr_online_nodes. So, the use of "nid >= nr_online_nodes" to judge if a node is online is wrong. Node id is a basic parameter of the system, a user-configured node must be checked as early as possible. Otherwise, it may cause panic when calling some vulnerable functions such as node_online which will cause panic if a very big node is received. Check g_home_node once users config it, and use node_available to make node-checking compatible with sparse/discontiguous nodes. Fixes: 7ff684a683d7 ("null_blk: prevent crash from bad home_node value") Signed-off-by: Peng Liu Suggested-by: Davidlohr Bueso --- drivers/block/null_blk/main.c | 45 ++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 17 deletions(-) diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index 05b1120e6623..995348d6e7e7 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -97,7 +97,33 @@ module_param_named(poll_queues, g_poll_queues, int, 0444); MODULE_PARM_DESC(poll_queues, "Number of IOPOLL submission queues"); static int g_home_node = NUMA_NO_NODE; -module_param_named(home_node, g_home_node, int, 0444); + +static int null_param_store_val(const char *str, int *val, int min, int max) +{ + int ret, new_val; + + ret = kstrtoint(str, 10, &new_val); + if (ret) + return -EINVAL; + + if (new_val < min || new_val > max) + return -EINVAL; + + *val = new_val; + return 0; +} + +static int null_set_home_node(const char *str, const struct kernel_param *kp) +{ + return null_param_store_val(str, &g_home_node, 0, MAX_NUMNODES - 1); +} + +static const struct kernel_param_ops null_home_node_param_ops = { + .set = null_set_home_node, + .get = param_get_int, +}; + +device_param_cb(home_node, &null_home_node_param_ops, &g_home_node, 0444); MODULE_PARM_DESC(home_node, "Home node for the device"); #ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION @@ -120,21 +146,6 @@ MODULE_PARM_DESC(init_hctx, "Fault injection to fail hctx init. init_hctx= max) - return -EINVAL; - - *val = new_val; - return 0; -} - static int null_set_queue_mode(const char *str, const struct kernel_param *kp) { return null_param_store_val(str, &g_queue_mode, NULL_Q_BIO, NULL_Q_MQ); @@ -2107,7 +2118,7 @@ static int __init null_init(void) g_max_sectors = BLK_DEF_MAX_SECTORS; } - if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) { + if (!node_available(g_home_node)) { pr_err("invalid home_node value\n"); g_home_node = NUMA_NO_NODE; } -- 2.25.1