From patchwork Thu Oct 1 04:33:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saeed Mahameed X-Patchwork-Id: 1374828 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=default header.b=VRrtmSgr; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4C20cY6nrsz9sSf for ; Thu, 1 Oct 2020 14:33:33 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730649AbgJAEdc (ORCPT ); Thu, 1 Oct 2020 00:33:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:39952 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725969AbgJAEdV (ORCPT ); Thu, 1 Oct 2020 00:33:21 -0400 Received: from sx1.lan (c-24-6-56-119.hsd1.ca.comcast.net [24.6.56.119]) (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 AF01622262; Thu, 1 Oct 2020 04:33:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601526799; bh=AfCbCNMcm4Cnqwur5wZ5dTXGN+JuPjOHx71khz22Qt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VRrtmSgrqjcoI42rctLbnKUxq+nf6a/boey4tcmJgw1WaWq2Iz6LY2xPLdt7SLQ6c 0sAf//UfIdsCOLuWSnM0VK0V3hLNWf9eeF2JFzpkOsG4dHh/K/JK0ZAIirs7qnAINx 50KkBfIulpurqxh40B63VwnzeZkrBuluq1y4KbSc= From: saeed@kernel.org To: "David S. Miller" , Jakub Kicinski Cc: netdev@vger.kernel.org, Dan Carpenter , Leon Romanovsky , Saeed Mahameed Subject: [net-next 14/15] net/mlx5e: Fix a use after free on error in mlx5_tc_ct_shared_counter_get() Date: Wed, 30 Sep 2020 21:33:01 -0700 Message-Id: <20201001043302.48113-15-saeed@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201001043302.48113-1-saeed@kernel.org> References: <20201001043302.48113-1-saeed@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Dan Carpenter 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 Signed-off-by: Saeed Mahameed --- 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);