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 54C0F38DE8; Fri, 24 Nov 2023 19:28:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="jjDJZ/bv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8A0BC433C7; Fri, 24 Nov 2023 19:28:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700854109; bh=o3OoDPqzxaitrbwy9Bks/IZ4tTkgPJXASScT2hBJPDs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jjDJZ/bveEcUmurbHelfVacvzQSsPGzzRgqTm3ZLnVQu7mLwazOEXY5MFHax6lNDT XI3LQf61KMKRlruOV1DeiGzuFnbiJnjjwrrbIk0hxGWISF6GATtM4uKWmWhQP1zLrG bbZp97uxHootmuOkexA2oARD4QyF+rtTNVJwEkcg= From: Greg Kroah-Hartman To: stable@vger.kernel.org, netfilter-devel@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pablo Neira Ayuso Subject: [PATCH 5.4 147/159] netfilter: nf_tables: GC transaction race with abort path Date: Fri, 24 Nov 2023 17:56:04 +0000 Message-ID: <20231124171947.907250032@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231124171941.909624388@linuxfoundation.org> References: <20231124171941.909624388@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-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: Greg Kroah-Hartman --- net/netfilter/nf_tables_api.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -7597,7 +7597,12 @@ static int nf_tables_abort(struct net *n enum nfnl_abort_action action) { struct nftables_pernet *nft_net = net_generic(net, nf_tables_net_id); - 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);