From patchwork Mon Jul 10 20:23:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacob Keller X-Patchwork-Id: 786369 X-Patchwork-Delegate: jeffrey.t.kirsher@intel.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3x5xVv2fQCz9s06 for ; Tue, 11 Jul 2017 06:23:35 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id E8F5688A7F; Mon, 10 Jul 2017 20:23:33 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jwE6QNjTNKPg; Mon, 10 Jul 2017 20:23:32 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by hemlock.osuosl.org (Postfix) with ESMTP id 0CAEB8899C; Mon, 10 Jul 2017 20:23:32 +0000 (UTC) X-Original-To: intel-wired-lan@lists.osuosl.org Delivered-To: intel-wired-lan@lists.osuosl.org Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by ash.osuosl.org (Postfix) with ESMTP id 1323F1CEAD0 for ; Mon, 10 Jul 2017 20:23:24 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id D247F88782 for ; Mon, 10 Jul 2017 20:23:24 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zmQbZwCzEAma for ; Mon, 10 Jul 2017 20:23:22 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by hemlock.osuosl.org (Postfix) with ESMTPS id E47608873D for ; Mon, 10 Jul 2017 20:23:21 +0000 (UTC) Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Jul 2017 13:23:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.40,342,1496127600"; d="scan'208";a="285198829" Received: from jekeller-desk.amr.corp.intel.com (HELO jekeller-desk.jekeller.internal) ([134.134.177.230]) by fmsmga004.fm.intel.com with ESMTP; 10 Jul 2017 13:23:20 -0700 From: Jacob Keller To: jtkirhse@osuosl.org, Intel Wired LAN Date: Mon, 10 Jul 2017 13:23:06 -0700 Message-Id: <20170710202319.22110-3-jacob.e.keller@intel.com> X-Mailer: git-send-email 2.13.0.615.gb09ed6e59a40 In-Reply-To: <20170710202319.22110-1-jacob.e.keller@intel.com> References: <20170710202319.22110-1-jacob.e.keller@intel.com> Cc: jekeller@osuosl.org Subject: [Intel-wired-lan] [PATCH v3 03/16] fm10k: avoid possible truncation of q_vector->name X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" New versions of GCC since version 7 began warning about possible truncation of calls to snprintf. We can fix this and avoid false positives. First, we should pass the full buffer size to snprintf, because it guarantees a NULL character as part of its passed length, so passing len-1 is simply wasting a byte of possible storage. Second, if we make the ri and ti variables unsigned, the compiler is able to correctly reason that the value never gets larger than 256, so it doesn't need to warn about the full space required to print a signed integer. Signed-off-by: Jacob Keller Tested-by: Krishneil Singh --- drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c index 3e26d27ad213..80b18f2479b4 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c @@ -1544,7 +1544,7 @@ int fm10k_qv_request_irq(struct fm10k_intfc *interface) struct net_device *dev = interface->netdev; struct fm10k_hw *hw = &interface->hw; struct msix_entry *entry; - int ri = 0, ti = 0; + unsigned int ri = 0, ti = 0; int vector, err; entry = &interface->msix_entries[NON_Q_VECTORS(hw)]; @@ -1554,15 +1554,15 @@ int fm10k_qv_request_irq(struct fm10k_intfc *interface) /* name the vector */ if (q_vector->tx.count && q_vector->rx.count) { - snprintf(q_vector->name, sizeof(q_vector->name) - 1, - "%s-TxRx-%d", dev->name, ri++); + snprintf(q_vector->name, sizeof(q_vector->name), + "%s-TxRx-%u", dev->name, ri++); ti++; } else if (q_vector->rx.count) { - snprintf(q_vector->name, sizeof(q_vector->name) - 1, - "%s-rx-%d", dev->name, ri++); + snprintf(q_vector->name, sizeof(q_vector->name), + "%s-rx-%u", dev->name, ri++); } else if (q_vector->tx.count) { - snprintf(q_vector->name, sizeof(q_vector->name) - 1, - "%s-tx-%d", dev->name, ti++); + snprintf(q_vector->name, sizeof(q_vector->name), + "%s-tx-%u", dev->name, ti++); } else { /* skip this unused q_vector */ continue;