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author | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-06-10 20:20:31 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-14 16:56:22 +0200 |
commit | ed3d4988349e969ccab5e3a571aac36b87144105 (patch) | |
tree | f2364d12e2476108be6b8d16ad982cbbcb997823 /net/netfilter | |
parent | cf28cb51f01b4b7b713ca416661576448f8eee7e (diff) | |
download | linux-stable-ed3d4988349e969ccab5e3a571aac36b87144105.tar.gz linux-stable-ed3d4988349e969ccab5e3a571aac36b87144105.tar.bz2 linux-stable-ed3d4988349e969ccab5e3a571aac36b87144105.zip |
netfilter: nft_osf: check for TCP packet before further processing
[ 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>
Diffstat (limited to 'net/netfilter')
-rw-r--r-- | net/netfilter/nft_osf.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/netfilter/nft_osf.c b/net/netfilter/nft_osf.c index c261d57a666a..2c957629ea66 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) { |