From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C4C266ADE for ; Mon, 28 Aug 2023 10:20:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 421F8C433C8; Mon, 28 Aug 2023 10:20:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1693218043; bh=nZbwt/aOincUZqNFixGr3zdZRZFBvUEGPXcbKw/Sq9M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TfSo6g631TpybFqO4XxGh3Yqz+ktpZJQHAq5lRrjQef0G1nVlDDIbovQvCjTJQs4C noty1+hU1BOa8WMc4CmBn9aPqg/cmyC5QyPtj53PBAYXXwW5PE5jThMObcFlKTAgUM Lp89k0K2/ohXqI1csDGjnsoCeD1+na20fvlxBLWY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pablo Neira Ayuso , Florian Westphal , Sasha Levin Subject: [PATCH 6.4 045/129] netfilter: nf_tables: GC transaction race with abort path Date: Mon, 28 Aug 2023 12:12:04 +0200 Message-ID: <20230828101158.866860095@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230828101157.383363777@linuxfoundation.org> References: <20230828101157.383363777@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pablo Neira Ayuso [ Upstream commit 720344340fb9be2765bbaab7b292ece0a4570eae ] Abort path is missing a synchronization point with GC transactions. Add GC sequence number hence any GC transaction losing race will be discarded. Fixes: 5f68718b34a5 ("netfilter: nf_tables: GC transaction API to avoid race with control plane") Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin --- net/netfilter/nf_tables_api.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 539bc5d5c12fd..9cd8c14a0faf4 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -10348,8 +10348,12 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb, enum nfnl_abort_action action) { struct nftables_pernet *nft_net = nft_pernet(net); - int ret = __nf_tables_abort(net, action); + unsigned int gc_seq; + int ret; + gc_seq = nft_gc_seq_begin(nft_net); + ret = __nf_tables_abort(net, action); + nft_gc_seq_end(nft_net, gc_seq); mutex_unlock(&nft_net->commit_mutex); return ret; -- 2.40.1