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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 CF5BEC07E9B for ; Mon, 19 Jul 2021 16:22:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC6F061175 for ; Mon, 19 Jul 2021 16:22:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346654AbhGSPlm (ORCPT ); Mon, 19 Jul 2021 11:41:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:57516 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347643AbhGSPfO (ORCPT ); Mon, 19 Jul 2021 11:35:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6D91C61585; Mon, 19 Jul 2021 16:12:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626711161; bh=3VbulVuZux7N5vm4eGkeSfR/Q6TdIl8kVzV8A7gfNGk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EJau3smF/Oi8bwTHIuwPApBDvQ4A2rZa3WQJ7W+cw/2Uxh34c7PpGT44P1Rd6xDI8 Lk+D3+ZMoaB1f2NNPwVfpvoK9ovU1Megk5VE+CdjHhjym1nyd349PY5VwZAcOWBfUd Xg3rTgH/ARKEDCJGHOxOn13unHGlA0b2W7ypgm3g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eli Cohen , "Michael S. Tsirkin" , Jason Wang , Sasha Levin Subject: [PATCH 5.13 251/351] vdpa/mlx5: Fix possible failure in umem size calculation Date: Mon, 19 Jul 2021 16:53:17 +0200 Message-Id: <20210719144953.261442638@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144944.537151528@linuxfoundation.org> References: <20210719144944.537151528@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Eli Cohen [ Upstream commit 71ab6a7cfbae27f86a3901daab10bfe13b3a1e3a ] umem size is a 32 bit unsigned value so assigning it to an int could cause false failures. Set the calculated value inside the function and modify function name to reflect the fact it updates the size. This bug was found during code review but never had real impact to this date. Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices") Signed-off-by: Eli Cohen Link: https://lore.kernel.org/r/20210530090349.8360-1-elic@nvidia.com Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang Signed-off-by: Sasha Levin --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index e8865e6adf37..01eb6c100d2d 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -611,8 +611,8 @@ static void cq_destroy(struct mlx5_vdpa_net *ndev, u16 idx) mlx5_db_free(ndev->mvdev.mdev, &vcq->db); } -static int umem_size(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq, int num, - struct mlx5_vdpa_umem **umemp) +static void set_umem_size(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq, int num, + struct mlx5_vdpa_umem **umemp) { struct mlx5_core_dev *mdev = ndev->mvdev.mdev; int p_a; @@ -635,7 +635,7 @@ static int umem_size(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq *umemp = &mvq->umem3; break; } - return p_a * mvq->num_ent + p_b; + (*umemp)->size = p_a * mvq->num_ent + p_b; } static void umem_frag_buf_free(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_umem *umem) @@ -651,15 +651,10 @@ static int create_umem(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *m void *in; int err; __be64 *pas; - int size; struct mlx5_vdpa_umem *umem; - size = umem_size(ndev, mvq, num, &umem); - if (size < 0) - return size; - - umem->size = size; - err = umem_frag_buf_alloc(ndev, umem, size); + set_umem_size(ndev, mvq, num, &umem); + err = umem_frag_buf_alloc(ndev, umem, umem->size); if (err) return err; -- 2.30.2