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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2848C54EE9 for ; Fri, 2 Sep 2022 12:21:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232681AbiIBMVb (ORCPT ); Fri, 2 Sep 2022 08:21:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47846 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235891AbiIBMVO (ORCPT ); Fri, 2 Sep 2022 08:21:14 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 66A1D1C918; Fri, 2 Sep 2022 05:20:21 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 2964FB82A8F; Fri, 2 Sep 2022 12:20:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 834E2C433D6; Fri, 2 Sep 2022 12:20:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1662121218; bh=pFKhXZLCEw9lbHn/kXTMOmBZMFo1jHjmSiJceNQgyTQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RFg4bdDL5cQs2w6e74lG1wquZ58PgEWBVR2TMkgtB5peqK8nLXrE32dGhe3HOUcfB yePxKCKVcCDbP3WXIQZFNyGgM/OzTbVi6Nf5gEHA6LK7q39AAWZgV/DWFkGXG5zGfZ aGh+fH4GWOfLyIbrOtX6bNXMojR1MqLc/gzjtSE8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xin Xiong , Xin Tan , Steffen Klassert , Sasha Levin Subject: [PATCH 4.9 02/31] xfrm: fix refcount leak in __xfrm_policy_check() Date: Fri, 2 Sep 2022 14:18:28 +0200 Message-Id: <20220902121356.838472344@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220902121356.732130937@linuxfoundation.org> References: <20220902121356.732130937@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xin Xiong [ Upstream commit 9c9cb23e00ddf45679b21b4dacc11d1ae7961ebe ] The issue happens on an error path in __xfrm_policy_check(). When the fetching process of the object `pols[1]` fails, the function simply returns 0, forgetting to decrement the reference count of `pols[0]`, which is incremented earlier by either xfrm_sk_policy_lookup() or xfrm_policy_lookup(). This may result in memory leaks. Fix it by decreasing the reference count of `pols[0]` in that path. Fixes: 134b0fc544ba ("IPsec: propagate security module errors up from flow_cache_lookup") Signed-off-by: Xin Xiong Signed-off-by: Xin Tan Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin --- net/xfrm/xfrm_policy.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 0894108f561cb..ae90a273475c0 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2538,6 +2538,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, if (pols[1]) { if (IS_ERR(pols[1])) { XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); + xfrm_pol_put(pols[0]); return 0; } pols[1]->curlft.use_time = get_seconds(); -- 2.35.1