From patchwork Mon Mar 30 00:36:47 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: 221607 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=unavailable 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 1A861C2D0E7 for ; Mon, 30 Mar 2020 00:38:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ED0D620780 for ; Mon, 30 Mar 2020 00:38:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728347AbgC3AiQ (ORCPT ); Sun, 29 Mar 2020 20:38:16 -0400 Received: from correo.us.es ([193.147.175.20]:57150 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726403AbgC3AhV (ORCPT ); Sun, 29 Mar 2020 20:37:21 -0400 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 573BEEF42F for ; Mon, 30 Mar 2020 02:37:19 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 47D2E100A50 for ; Mon, 30 Mar 2020 02:37:19 +0200 (CEST) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 3CC44100A4C; Mon, 30 Mar 2020 02:37:19 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 53143100A4B; Mon, 30 Mar 2020 02:37:17 +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 02:37:17 +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 2CFE842EF42A; Mon, 30 Mar 2020 02:37:17 +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 05/26] netfilter: nf_tables: add nft_set_elem_expr_destroy() and use it Date: Mon, 30 Mar 2020 02:36:47 +0200 Message-Id: <20200330003708.54017-6-pablo@netfilter.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200330003708.54017-1-pablo@netfilter.org> References: <20200330003708.54017-1-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 This patch adds nft_set_elem_expr_destroy() to destroy stateful expressions in set elements. This patch also updates the commit path to call this function to invoke expr->ops->destroy_clone when required. This is implicitly fixing up a module reference counter leak and a memory leak in expressions that allocated internal state, e.g. nft_counter. Fixes: 409444522976 ("netfilter: nf_tables: add elements with stateful expressions") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_tables_api.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 29ad33e52dbb..c5332a313283 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -4882,6 +4882,17 @@ void *nft_set_elem_init(const struct nft_set *set, return elem; } +static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, + struct nft_expr *expr) +{ + if (expr->ops->destroy_clone) { + expr->ops->destroy_clone(ctx, expr); + module_put(expr->ops->type->owner); + } else { + nf_tables_expr_destroy(ctx, expr); + } +} + void nft_set_elem_destroy(const struct nft_set *set, void *elem, bool destroy_expr) { @@ -4894,16 +4905,9 @@ void nft_set_elem_destroy(const struct nft_set *set, void *elem, nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) nft_data_release(nft_set_ext_data(ext), set->dtype); - if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) { - struct nft_expr *expr = nft_set_ext_expr(ext); + if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) + nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext)); - if (expr->ops->destroy_clone) { - expr->ops->destroy_clone(&ctx, expr); - module_put(expr->ops->type->owner); - } else { - nf_tables_expr_destroy(&ctx, expr); - } - } if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) (*nft_set_ext_obj(ext))->use--; kfree(elem); @@ -4919,7 +4923,8 @@ static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, struct nft_set_ext *ext = nft_set_elem_ext(set, elem); if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) - nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext)); + nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext)); + kfree(elem); } @@ -5182,7 +5187,8 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, err_trans: if (obj) obj->use--; - kfree(elem.priv); + + nf_tables_set_elem_destroy(ctx, set, elem.priv); err_parse_data: if (nla[NFTA_SET_ELEM_DATA] != NULL) nft_data_release(&data, desc.type);