From patchwork Mon Aug 28 00:15:53 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirsher, Jeffrey T" X-Patchwork-Id: 806321 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3xgXQC6Vlrz9s82 for ; Mon, 28 Aug 2017 10:17:07 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751825AbdH1ARG (ORCPT ); Sun, 27 Aug 2017 20:17:06 -0400 Received: from mga14.intel.com ([192.55.52.115]:47467 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751493AbdH1AQT (ORCPT ); Sun, 27 Aug 2017 20:16:19 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Aug 2017 17:16:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.41,439,1498546800"; d="scan'208";a="304981066" Received: from davidpwo-mobl1.amr.corp.intel.com (HELO jtkirshe-DESK.amr.corp.intel.com.com) ([10.254.22.134]) by fmsmga004.fm.intel.com with ESMTP; 27 Aug 2017 17:16:18 -0700 From: Jeff Kirsher To: davem@davemloft.net Cc: Jacob Keller , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, jogreene@redhat.com, Jeff Kirsher Subject: [net-next 05/15] i40evf: fix possible snprintf truncation of q_vector->name Date: Sun, 27 Aug 2017 17:15:53 -0700 Message-Id: <20170828001603.75876-6-jeffrey.t.kirsher@intel.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170828001603.75876-1-jeffrey.t.kirsher@intel.com> References: <20170828001603.75876-1-jeffrey.t.kirsher@intel.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jacob Keller The q_vector names are based on the interface name with a driver prefix, the type of q_vector setup, and the queue number. We previously set the size of this variable to IFNAMSIZ + 9, which is incorrect, because we actually include a minimum of 14 characters extra beyond the interface name size. New versions of GCC since 7 include a new warning that detects this possible truncation and complains. We can fix this by increasing the size in case our interface name is too large to avoid truncation. We don't need to go beyond 14 because the compiler is smart enough to realize our values can never exceed size of 1. We do go up to 15 here because possible future changes may increase the number of queues beyond one digit. While we are here, also change some variables to be unsigned (since they are never negative) and stop using an extra unnecessary %s format specifier. Signed-off-by: Jacob Keller Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40evf/i40evf.h | 2 +- drivers/net/ethernet/intel/i40evf/i40evf_main.c | 21 +++++++++------------ 2 files changed, 10 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/intel/i40evf/i40evf.h b/drivers/net/ethernet/intel/i40evf/i40evf.h index d310544c6c6e..e5293d35fb6a 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf.h +++ b/drivers/net/ethernet/intel/i40evf/i40evf.h @@ -121,7 +121,7 @@ struct i40e_q_vector { #define ITR_COUNTDOWN_START 100 u8 itr_countdown; /* when 0 or 1 update ITR */ int v_idx; /* vector index in list */ - char name[IFNAMSIZ + 9]; + char name[IFNAMSIZ + 15]; bool arm_wb_state; cpumask_t affinity_mask; struct irq_affinity_notify affinity_notify; diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c index 0d87191b6bac..258e8e27068b 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c +++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c @@ -543,9 +543,9 @@ static void i40evf_irq_affinity_release(struct kref *ref) {} static int i40evf_request_traffic_irqs(struct i40evf_adapter *adapter, char *basename) { - int vector, err, q_vectors; - int rx_int_idx = 0, tx_int_idx = 0; - int irq_num; + unsigned int vector, q_vectors; + unsigned int rx_int_idx = 0, tx_int_idx = 0; + int irq_num, err; i40evf_irq_disable(adapter); /* Decrement for Other and TCP Timer vectors */ @@ -556,18 +556,15 @@ i40evf_request_traffic_irqs(struct i40evf_adapter *adapter, char *basename) irq_num = adapter->msix_entries[vector + NONQ_VECS].vector; if (q_vector->tx.ring && q_vector->rx.ring) { - snprintf(q_vector->name, sizeof(q_vector->name) - 1, - "i40evf-%s-%s-%d", basename, - "TxRx", rx_int_idx++); + snprintf(q_vector->name, sizeof(q_vector->name), + "i40evf-%s-TxRx-%d", basename, rx_int_idx++); tx_int_idx++; } else if (q_vector->rx.ring) { - snprintf(q_vector->name, sizeof(q_vector->name) - 1, - "i40evf-%s-%s-%d", basename, - "rx", rx_int_idx++); + snprintf(q_vector->name, sizeof(q_vector->name), + "i40evf-%s-rx-%d", basename, rx_int_idx++); } else if (q_vector->tx.ring) { - snprintf(q_vector->name, sizeof(q_vector->name) - 1, - "i40evf-%s-%s-%d", basename, - "tx", tx_int_idx++); + snprintf(q_vector->name, sizeof(q_vector->name), + "i40evf-%s-tx-%d", basename, tx_int_idx++); } else { /* skip this unused q_vector */ continue;