From patchwork Mon Sep 28 09:05:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Carpenter X-Patchwork-Id: 11803177 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A466A6CA for ; Mon, 28 Sep 2020 09:08:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 801AB21D95 for ; Mon, 28 Sep 2020 09:08:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="SHrRNC/E" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726534AbgI1JIR (ORCPT ); Mon, 28 Sep 2020 05:08:17 -0400 Received: from aserp2130.oracle.com ([141.146.126.79]:42102 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726465AbgI1JIR (ORCPT ); Mon, 28 Sep 2020 05:08:17 -0400 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08S93hJV194769; Mon, 28 Sep 2020 09:08:07 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : mime-version : content-type; s=corp-2020-01-29; bh=jfgO1O7Ck5C96o5hB9CZqDDeCkVWsRHno5yUPfNdobY=; b=SHrRNC/EYgSqWf4UMZAt3acjFOmY5dZWWBZfeuJeATXT0EwqrgvmSi85QE0GN2g0LF88 1MKsDKM/XrrToIC/1RxJWNPBIdAxSj/M9oUHydCZUCpe4BpK8CwRDOTSu6xcnAEsLU60 UsUxkdWFDIWu3CVo3VERK4MqaVy4hmDdnjWQEkTHrIxbJ1baKc18cvqa9eVj03Mhbudi tYbyeLSB4I1H7IkMKrsWj6c5PyN1SnfCPjSDXphucBSWBWEtO48ddbwu+wZ4edZvmV8R gWBlWPbGUNW7rJIFfzXxKDAWdjDmhnLhLv70OxRhVhcZzsR3QzWYzI7OBVq2bWHr/SYo 8A== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2130.oracle.com with ESMTP id 33su5am0uc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 28 Sep 2020 09:08:07 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08S94jHF072788; Mon, 28 Sep 2020 09:06:06 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 33tf7k2mmm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 28 Sep 2020 09:06:06 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 08S964Hi006320; Mon, 28 Sep 2020 09:06:04 GMT Received: from mwanda (/41.57.98.10) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 28 Sep 2020 02:06:04 -0700 Date: Mon, 28 Sep 2020 12:05:56 +0300 From: Dan Carpenter To: Saeed Mahameed Cc: Leon Romanovsky , "David S. Miller" , Jakub Kicinski , Roi Dayan , Oz Shlomo , Paul Blakey , Eli Britstein , Ariel Levkovich , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH net-next] net/mlx5e: Fix a use after free on error in mlx5_tc_ct_shared_counter_get() Message-ID: <20200928090556.GA377727@mwanda> MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9757 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 malwarescore=0 phishscore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009280076 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9757 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 suspectscore=0 lowpriorityscore=0 spamscore=0 clxscore=1011 mlxscore=0 impostorscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009280076 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org This code frees "shared_counter" and then dereferences on the next line to get the error code. Fixes: 1edae2335adf ("net/mlx5e: CT: Use the same counter for both directions") Signed-off-by: Dan Carpenter Reviewed-by: Leon Romanovsky --- drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c index b5f8ed30047b..cea2070af9af 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c @@ -739,6 +739,7 @@ mlx5_tc_ct_shared_counter_get(struct mlx5_tc_ct_priv *ct_priv, struct mlx5_core_dev *dev = ct_priv->dev; struct mlx5_ct_entry *rev_entry; __be16 tmp_port; + int ret; /* get the reversed tuple */ tmp_port = rev_tuple.port.src; @@ -778,8 +779,9 @@ mlx5_tc_ct_shared_counter_get(struct mlx5_tc_ct_priv *ct_priv, shared_counter->counter = mlx5_fc_create(dev, true); if (IS_ERR(shared_counter->counter)) { ct_dbg("Failed to create counter for ct entry"); + ret = PTR_ERR(shared_counter->counter); kfree(shared_counter); - return ERR_PTR(PTR_ERR(shared_counter->counter)); + return ERR_PTR(ret); } refcount_set(&shared_counter->refcount, 1);