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=-15.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,HK_RANDOM_FROM,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 B8769C11F66 for ; Wed, 14 Jul 2021 07:58:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9F4D66135A for ; Wed, 14 Jul 2021 07:58:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238396AbhGNIA6 (ORCPT ); Wed, 14 Jul 2021 04:00:58 -0400 Received: from mga06.intel.com ([134.134.136.31]:50798 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238343AbhGNIA4 (ORCPT ); Wed, 14 Jul 2021 04:00:56 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10044"; a="271416418" X-IronPort-AV: E=Sophos;i="5.84,238,1620716400"; d="scan'208";a="271416418" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jul 2021 00:58:04 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,238,1620716400"; d="scan'208";a="505139965" Received: from npg-dpdk-haiyue-1.sh.intel.com ([10.67.118.197]) by fmsmga002.fm.intel.com with ESMTP; 14 Jul 2021 00:57:56 -0700 From: Haiyue Wang To: netdev@vger.kernel.org Cc: Haiyue Wang , Catherine Sullivan , Sagi Shahar , Jon Olson , "David S. Miller" , Jakub Kicinski , David Awogbemila , Yangchun Fu , Willem de Bruijn , Bailey Forrest , Kuo Zhao , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v1] gve: fix the wrong AdminQ buffer overflow check Date: Wed, 14 Jul 2021 15:34:59 +0800 Message-Id: <20210714073501.133736-1-haiyue.wang@intel.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The 'tail' pointer is also free-running count, so it needs to be masked as 'adminq_prod_cnt' does, to become an index value of AdminQ buffer. Fixes: 5cdad90de62c ("gve: Batch AQ commands for creating and destroying queues.") Signed-off-by: Haiyue Wang --- drivers/net/ethernet/google/gve/gve_adminq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/google/gve/gve_adminq.c b/drivers/net/ethernet/google/gve/gve_adminq.c index 5bb56b454541..f089d33dd48e 100644 --- a/drivers/net/ethernet/google/gve/gve_adminq.c +++ b/drivers/net/ethernet/google/gve/gve_adminq.c @@ -322,7 +322,8 @@ static int gve_adminq_issue_cmd(struct gve_priv *priv, tail = ioread32be(&priv->reg_bar0->adminq_event_counter); // Check if next command will overflow the buffer. - if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) == tail) { + if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) == + (tail & priv->adminq_mask)) { int err; // Flush existing commands to make room. @@ -332,7 +333,8 @@ static int gve_adminq_issue_cmd(struct gve_priv *priv, // Retry. tail = ioread32be(&priv->reg_bar0->adminq_event_counter); - if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) == tail) { + if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) == + (tail & priv->adminq_mask)) { // This should never happen. We just flushed the // command queue so there should be enough space. return -ENOMEM; -- 2.32.0