| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.12 421/700] netfilter: nft_osf: check for TCP packet before further processing | Date | Mon, 12 Jul 2021 08:08:24 +0200 |
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From: Pablo Neira Ayuso <pablo@netfilter.org>
[ Upstream commit 8f518d43f89ae00b9cf5460e10b91694944ca1a8 ]
The osf expression only supports for TCP packets, add a upfront sanity check to skip packet parsing if this is not a TCP packet.
Fixes: b96af92d6eaf ("netfilter: nf_tables: implement Passive OS fingerprint module in nft_osf") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/netfilter/nft_osf.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/net/netfilter/nft_osf.c b/net/netfilter/nft_osf.c index ac61f708b82d..d82677e83400 100644 --- a/net/netfilter/nft_osf.c +++ b/net/netfilter/nft_osf.c @@ -28,6 +28,11 @@ static void nft_osf_eval(const struct nft_expr *expr, struct nft_regs *regs, struct nf_osf_data data; struct tcphdr _tcph; + if (pkt->tprot != IPPROTO_TCP) { + regs->verdict.code = NFT_BREAK; + return; + } + tcp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(struct tcphdr), &_tcph); if (!tcp) { -- 2.30.2
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