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 53B211D54A for ; Wed, 4 Oct 2023 18:11:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9D13C433C8; Wed, 4 Oct 2023 18:11:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696443079; bh=YpM1vaeCblHHB6VBKPx0H1ZnWhwB+SJLK6WLDcPwZes=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=naJCAPciPI3DXRshVPRjHu4HAs8+UWKF1SavfU/ZPADKXLcYNQ8VYfVlpX9GJxsX0 1HuAmCepFfIob1SHK1/+0C0n+pn3Y6/HV9Q0UHVbce+6ltweNq0+WdjCVGsA/RJ7TH SxQxg3gJKe73pEcNJV9fTFksRW8gpmXxfCjJkHRs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 6.1 028/259] netfilter: nf_tables: GC transaction race with abort path Date: Wed, 4 Oct 2023 19:53:21 +0200 Message-ID: <20231004175218.730533996@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231004175217.404851126@linuxfoundation.org> References: <20231004175217.404851126@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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pablo Neira Ayuso commit 720344340fb9be2765bbaab7b292ece0a4570eae upstream. 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: Sasha Levin --- net/netfilter/nf_tables_api.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 53ee6ac16f9e9..0455af9a66af1 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -9969,7 +9969,12 @@ 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); -- 2.40.1