From patchwork Mon Mar 30 19:21:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 221574 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 286CEC43331 for ; Mon, 30 Mar 2020 19:22:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0568B20748 for ; Mon, 30 Mar 2020 19:22:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728709AbgC3TWI (ORCPT ); Mon, 30 Mar 2020 15:22:08 -0400 Received: from correo.us.es ([193.147.175.20]:48520 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728169AbgC3TWB (ORCPT ); Mon, 30 Mar 2020 15:22:01 -0400 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id E8204B508F for ; Mon, 30 Mar 2020 21:21:56 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id C7B3C12B68F for ; Mon, 30 Mar 2020 21:21:56 +0200 (CEST) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 938E6114D66; Mon, 30 Mar 2020 21:21:43 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 599AA100A47; Mon, 30 Mar 2020 21:21:41 +0200 (CEST) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Mon, 30 Mar 2020 21:21:41 +0200 (CEST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from salvia.here (unknown [90.77.255.23]) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPA id 2033542EF4E0; Mon, 30 Mar 2020 21:21:41 +0200 (CEST) X-SMTPAUTHUS: auth mail.us.es From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org Subject: [PATCH 04/28] netfilter: nf_tables: fix double-free on set expression from the error path Date: Mon, 30 Mar 2020 21:21:12 +0200 Message-Id: <20200330192136.230459-5-pablo@netfilter.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200330192136.230459-1-pablo@netfilter.org> References: <20200330192136.230459-1-pablo@netfilter.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org After copying the expression to the set element extension, release the expression and reset the pointer to avoid a double-free from the error path. Fixes: 409444522976 ("netfilter: nf_tables: add elements with stateful expressions") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_tables_api.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index f1910cd795fd..29ad33e52dbb 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -5133,6 +5133,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, if (expr) { memcpy(nft_set_ext_expr(ext), expr, expr->ops->size); kfree(expr); + expr = NULL; } trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);