From patchwork Thu Dec 12 11:13:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 1208829 X-Patchwork-Delegate: jeffrey.t.kirsher@intel.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org (client-ip=140.211.166.136; helo=silver.osuosl.org; envelope-from=intel-wired-lan-bounces@osuosl.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=intel.com Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 47Yklm4hhQz9sPT for ; Fri, 13 Dec 2019 06:44:52 +1100 (AEDT) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id EB8FB25343; Thu, 12 Dec 2019 19:44:50 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8P+Pz5KrAh-w; Thu, 12 Dec 2019 19:44:48 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by silver.osuosl.org (Postfix) with ESMTP id 0B2E5251AE; Thu, 12 Dec 2019 19:44:47 +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 864091BF340 for ; Thu, 12 Dec 2019 19:44:40 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 763D8888C3 for ; Thu, 12 Dec 2019 19:44:40 +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 92Rd-aOMviDb for ; Thu, 12 Dec 2019 19:44:38 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by hemlock.osuosl.org (Postfix) with ESMTPS id DA08F888C7 for ; Thu, 12 Dec 2019 19:44:37 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Dec 2019 11:44:36 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,306,1571727600"; d="scan'208";a="296698860" Received: from unknown (HELO localhost.jf.intel.com) ([10.166.244.174]) by orsmga001.jf.intel.com with ESMTP; 12 Dec 2019 11:44:35 -0800 From: Tony Nguyen To: intel-wired-lan@lists.osuosl.org Date: Thu, 12 Dec 2019 03:13:05 -0800 Message-Id: <20191212111307.33566-13-anthony.l.nguyen@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191212111307.33566-1-anthony.l.nguyen@intel.com> References: <20191212111307.33566-1-anthony.l.nguyen@intel.com> MIME-Version: 1.0 Subject: [Intel-wired-lan] [PATCH S35 13/15] ice: add extra check for null rx descriptor X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" From: Mitch Williams In the case where the hardware gives us a null rx descriptor, it is theoretically possible that we could call one of our skb-construction functions with no data pointer, which would cause a panic. In real life, this will never happen - we only get null RX descriptors as the final descriptor in a chain of otherwise-valid descriptors. When this happens, the skb will be extant and we'll just call ice_add_rx_frag(), which can deal with empty data buffers. Unfortunately, Coverity does not have intimate knowledge of our hardware, so we must add a check here. Signed-off-by: Mitch Williams Tested-by: Andrew Bowers --- drivers/net/ethernet/intel/ice/ice_txrx.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c index b77514bbd7ba..fd17ace6b226 100644 --- a/drivers/net/ethernet/intel/ice/ice_txrx.c +++ b/drivers/net/ethernet/intel/ice/ice_txrx.c @@ -1071,13 +1071,16 @@ static int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget) ice_put_rx_buf(rx_ring, rx_buf); continue; construct_skb: - if (skb) + if (skb) { ice_add_rx_frag(rx_ring, rx_buf, skb, size); - else if (ice_ring_uses_build_skb(rx_ring)) - skb = ice_build_skb(rx_ring, rx_buf, &xdp); - else + } else if (likely(xdp.data)) { + if (ice_ring_uses_build_skb(rx_ring)) + skb = ice_build_skb(rx_ring, rx_buf, &xdp); + else + skb = ice_construct_skb(rx_ring, rx_buf, &xdp); + } else { skb = ice_construct_skb(rx_ring, rx_buf, &xdp); - + } /* exit if we failed to retrieve a buffer */ if (!skb) { rx_ring->rx_stats.alloc_buf_failed++;