From patchwork Thu Sep 16 16:02:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 513603 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=-19.1 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 564DAC3F2C2 for ; Thu, 16 Sep 2021 17:44:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 464B460E54 for ; Thu, 16 Sep 2021 17:44:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355969AbhIPRom (ORCPT ); Thu, 16 Sep 2021 13:44:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:57082 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355391AbhIPRlZ (ORCPT ); Thu, 16 Sep 2021 13:41:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D315C6325B; Thu, 16 Sep 2021 16:52:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631811167; bh=KQitGf8LgkA60yKy0J2jv/cD9eB25l1vJw9SYw5CHR4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UgENbITdihsNu7m0HNNLgsCLdXYKzTttMCfEIHPz2erBtHiJJAcBuz7wkcRngvlLP VeXBqNbv/KBJw6hQWAKDnyzJ1t3gONLdq7iyN8j/4G1X7GksZ5g1SE0HJYmqObmgCU jSa10z20QB5+dzMCyULoUeSqC9AKC2Rcijzny7ho= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wentao_Liang , Saeed Mahameed , Sasha Levin Subject: [PATCH 5.14 375/432] net/mlx5: DR, fix a potential use-after-free bug Date: Thu, 16 Sep 2021 18:02:04 +0200 Message-Id: <20210916155823.524306805@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210916155810.813340753@linuxfoundation.org> References: <20210916155810.813340753@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Wentao_Liang [ Upstream commit 6cc64770fb386b10a64a1fe09328396de7bb5262 ] In line 849 (#1), "mlx5dr_htbl_put(cur_htbl);" drops the reference to cur_htbl and may cause cur_htbl to be freed. However, cur_htbl is subsequently used in the next line, which may result in an use-after-free bug. Fix this by calling mlx5dr_err() before the cur_htbl is put. Signed-off-by: Wentao_Liang Signed-off-by: Saeed Mahameed Signed-off-by: Sasha Levin --- drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c index 43356fad53de..ffdfb5a94b14 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c @@ -846,9 +846,9 @@ dr_rule_handle_ste_branch(struct mlx5dr_rule *rule, new_htbl = dr_rule_rehash(rule, nic_rule, cur_htbl, ste_location, send_ste_list); if (!new_htbl) { - mlx5dr_htbl_put(cur_htbl); mlx5dr_err(dmn, "Failed creating rehash table, htbl-log_size: %d\n", cur_htbl->chunk_size); + mlx5dr_htbl_put(cur_htbl); } else { cur_htbl = new_htbl; }