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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12C3FC35640 for ; Fri, 21 Feb 2020 07:53:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D85C420801 for ; Fri, 21 Feb 2020 07:53:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582271631; bh=UsiEZwaNCOzGinm9GY9LYQeSFH9pbbl3cGztO6ANsr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=s9SpaJMNu6WU2pUXLQ9Sp6qOK/79L4u0dieoUsjAALCNw3qd1H9DH2oAZ20Gw2Lkm zJpbvTe0K1Tk0jzCj7vHhV1rtjCb8G5ear28Hwsb2lmKNDvuqPiaBtXDcovG7O0YgZ 8BIL2aZ7lbElb/X5QYSksS02Qej45tLAiMLWzm4c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730165AbgBUHxu (ORCPT ); Fri, 21 Feb 2020 02:53:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:52178 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730153AbgBUHxq (ORCPT ); Fri, 21 Feb 2020 02:53:46 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8CC0420801; Fri, 21 Feb 2020 07:53:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582271626; bh=UsiEZwaNCOzGinm9GY9LYQeSFH9pbbl3cGztO6ANsr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FNXvGvZmdjPLjC+sCYojhNLTjQv6SZYhzlbMs+rrNkyCAmTaHh7yfiIHP1nWoBHGl G5h4opTvO5AYV0oBGco2qR5HCmi7P8NUj/XrtJ35ZGt1eJM6C/A/hEta9+PmFHKoyH myXTs4vVbvVUxpIWEbgvWIPmHFuKIJNn+MR349ig= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mitch Williams , Andrew Bowers , Jeff Kirsher , Sasha Levin Subject: [PATCH 5.5 199/399] ice: add extra check for null Rx descriptor Date: Fri, 21 Feb 2020 08:38:44 +0100 Message-Id: <20200221072422.152591489@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200221072402.315346745@linuxfoundation.org> References: <20200221072402.315346745@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mitch Williams [ Upstream commit 1f45ebe0d8fbe6178670b663005f38ef8535db5d ] 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 Signed-off-by: Jeff Kirsher Signed-off-by: Sasha Levin --- 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 2c212f64d99f2..8b2b9e254d28d 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++; -- 2.20.1