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 3A0D228DD9 for ; Mon, 9 Oct 2023 13:41:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="bcchAaR9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ABFACC433C8; Mon, 9 Oct 2023 13:41:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696858912; bh=LMp5tPAm9ByF33cVux4M8S2gvUTq9Qqr1e2bJFgdMBg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bcchAaR9ZLpyuLY51DuYYYK/raCJ6PIZbd4oMT0ix6Pm8C/4ZeOR3ev/3/QfaHbVq 1N/1FMQYa9DT4BB0rIYb5S3Z/wFtujOBM1qc8E2R/4qiafqNx6GViBTFDeIjLZK/t2 QKZ+t0Yzt9zBFblQk2pv6+Yo4heWH1o2vcWmzxBw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Phil Sutter , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.10 139/226] netfilter: nft_exthdr: Search chunks in SCTP packets only Date: Mon, 9 Oct 2023 15:01:40 +0200 Message-ID: <20231009130130.373671698@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130126.697995596@linuxfoundation.org> References: <20231009130126.697995596@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 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Phil Sutter [ Upstream commit 5acc44f39458f43dac9724cefa4da29847cfe997 ] Since user space does not generate a payload dependency, plain sctp chunk matches cause searching in non-SCTP packets, too. Avoid this potential mis-interpretation of packet data by checking pkt->tprot. Fixes: 133dc203d77df ("netfilter: nft_exthdr: Support SCTP chunks") Signed-off-by: Phil Sutter Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nft_exthdr.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c index b4682aeabab96..274c5f0085186 100644 --- a/net/netfilter/nft_exthdr.c +++ b/net/netfilter/nft_exthdr.c @@ -371,6 +371,9 @@ static void nft_exthdr_sctp_eval(const struct nft_expr *expr, const struct sctp_chunkhdr *sch; struct sctp_chunkhdr _sch; + if (pkt->tprot != IPPROTO_SCTP) + goto err; + do { sch = skb_header_pointer(pkt->skb, offset, sizeof(_sch), &_sch); if (!sch || !sch->length) @@ -391,7 +394,7 @@ static void nft_exthdr_sctp_eval(const struct nft_expr *expr, } offset += SCTP_PAD4(ntohs(sch->length)); } while (offset < pkt->skb->len); - +err: if (priv->flags & NFT_EXTHDR_F_PRESENT) nft_reg_store8(dest, false); else -- 2.40.1