From patchwork Thu Mar 21 11:21:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 13598653 X-Patchwork-Delegate: kuba@kernel.org Received: from mail.netfilter.org (mail.netfilter.org [217.70.188.207]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A630B58207; Thu, 21 Mar 2024 11:21:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.188.207 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711020087; cv=none; b=KsmWbxA3nD5rkj4CMAr9KRRySZynxG+wEJYuLRTcQ4PxCEmBEBLBJuBLRXGO0yORLqLaQGDQG6KbCHIhO3MJ1eslRKq/skdDODO0hUdw7CkgDlQPc8psDtqIyAoNFawiR+7NrOFyb+WPXSaRCBfqonFl17xlH3HlqV+/F3deOpg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711020087; c=relaxed/simple; bh=gSSBpdER9TGv/BZyNYyFKp9TWtGygAfVn/YBysqspUA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=pPfRaPiC+pjYEFDnOc8Y8olK6Ei0t/6RUXVn1CM8ZPVeXJm2o8fdVMC1TvFd9WHbfGOfE7TpWkEFKccxJ4nHtIyZ8zb7AaZD5+u0vXXDvM5eqp9OJZMk5B/ajmnk+wtyuXTOn7OYM/Y1AX7482+Om4obEc32DDn5YZICKaZxxTo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org; spf=pass smtp.mailfrom=netfilter.org; arc=none smtp.client-ip=217.70.188.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=netfilter.org From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com Subject: [PATCH net 3/3] netfilter: nf_tables: Fix a memory leak in nf_tables_updchain Date: Thu, 21 Mar 2024 12:21:17 +0100 Message-Id: <20240321112117.36737-4-pablo@netfilter.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20240321112117.36737-1-pablo@netfilter.org> References: <20240321112117.36737-1-pablo@netfilter.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Quan Tian If nft_netdev_register_hooks() fails, the memory associated with nft_stats is not freed, causing a memory leak. This patch fixes it by moving nft_stats_alloc() down after nft_netdev_register_hooks() succeeds. Fixes: b9703ed44ffb ("netfilter: nf_tables: support for adding new devices to an existing netdev chain") Signed-off-by: Quan Tian Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_tables_api.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 984c1c83ee38..5fa3d3540c93 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -2631,19 +2631,6 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, } } - if (nla[NFTA_CHAIN_COUNTERS]) { - if (!nft_is_base_chain(chain)) { - err = -EOPNOTSUPP; - goto err_hooks; - } - - stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); - if (IS_ERR(stats)) { - err = PTR_ERR(stats); - goto err_hooks; - } - } - if (!(table->flags & NFT_TABLE_F_DORMANT) && nft_is_base_chain(chain) && !list_empty(&hook.list)) { @@ -2658,6 +2645,20 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, } unregister = true; + + if (nla[NFTA_CHAIN_COUNTERS]) { + if (!nft_is_base_chain(chain)) { + err = -EOPNOTSUPP; + goto err_hooks; + } + + stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); + if (IS_ERR(stats)) { + err = PTR_ERR(stats); + goto err_hooks; + } + } + err = -ENOMEM; trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, sizeof(struct nft_trans_chain));