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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham 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 45726C43381 for ; Wed, 13 Feb 2019 23:45:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 136122229F for ; Wed, 13 Feb 2019 23:45:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387940AbfBMXpo (ORCPT ); Wed, 13 Feb 2019 18:45:44 -0500 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:49134 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728665AbfBMXpn (ORCPT ); Wed, 13 Feb 2019 18:45:43 -0500 Received: from Internal Mail-Server by MTLPINE1 (envelope-from saeedm@mellanox.com) with ESMTPS (AES256-SHA encrypted); 14 Feb 2019 01:45:40 +0200 Received: from sx1.mtl.com ([172.16.5.60]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id x1DNjZwF032241; Thu, 14 Feb 2019 01:45:38 +0200 From: Saeed Mahameed To: "David S. Miller" Cc: netdev@vger.kernel.org, Maria Pasechnik , Tariq Toukan , Saeed Mahameed Subject: [net 1/4] net/mlx5e: Fix NULL pointer derefernce in set channels error flow Date: Wed, 13 Feb 2019 15:44:48 -0800 Message-Id: <20190213234451.27029-2-saeedm@mellanox.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190213234451.27029-1-saeedm@mellanox.com> References: <20190213234451.27029-1-saeedm@mellanox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Maria Pasechnik New channels are applied to the priv channels only after they are successfully opened. Then, the indirection table should be built according to the new number of channels. Currently, such build is preformed independently of whether the channels opening is successful, and is not reverted on failure. The bug is caused due to removal of rss params from channels struct and moving it to priv struct. That change cause to independency between channels and rss params. This causes a crash on a later point, when accessing rqn of a non existing channel. This patch fixes it by moving the indirection table build right before switching the priv channels to new channels struct, after the new set of channels was successfully opened. Fixes: bbeb53b8b2c9 ("net/mlx5e: Move RSS params to a dedicated struct") Signed-off-by: Maria Pasechnik Reviewed-by: Tariq Toukan Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c index 3bbccead2f63..47233b9a4f81 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c @@ -354,9 +354,6 @@ int mlx5e_ethtool_set_channels(struct mlx5e_priv *priv, new_channels.params = priv->channels.params; new_channels.params.num_channels = count; - if (!netif_is_rxfh_configured(priv->netdev)) - mlx5e_build_default_indir_rqt(priv->rss_params.indirection_rqt, - MLX5E_INDIR_RQT_SIZE, count); if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) { priv->channels.params = new_channels.params; @@ -372,6 +369,10 @@ int mlx5e_ethtool_set_channels(struct mlx5e_priv *priv, if (arfs_enabled) mlx5e_arfs_disable(priv); + if (!netif_is_rxfh_configured(priv->netdev)) + mlx5e_build_default_indir_rqt(priv->rss_params.indirection_rqt, + MLX5E_INDIR_RQT_SIZE, count); + /* Switch to new channels, set new parameters and close old ones */ mlx5e_switch_priv_channels(priv, &new_channels, NULL); -- 2.20.1