netfilter: nfnetlink_osf: add missing fmatch check

commit 1a6a0951fc009f6d9fe8ebea2d2417d80d54097b upstream.

When we check the tcp options of a packet and it doesn't match the current
fingerprint, the tcp packet option pointer must be restored to its initial
value in order to do the proper tcp options check for the next fingerprint.

Here we can see an example.
Assumming the following fingerprint base with two lines:

S10:64:1:60:M*,S,T,N,W6:      Linux:3.0::Linux 3.0
S20:64:1:60:M*,S,T,N,W7:      Linux:4.19:arch:Linux 4.1

Where TCP options are the last field in the OS signature, all of them overlap
except by the last one, ie. 'W6' versus 'W7'.

In case a packet for Linux 4.19 kicks in, the osf finds no matching because the
TCP options pointer is updated after checking for the TCP options in the first
line.

Therefore, reset pointer back to where it should be.

Fixes: 11eeef41 ("netfilter: passive OS fingerprint xtables match")
Signed-off-by: NFernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

net/netfilter/nfnetlink_osf.c

@@ -71,6 +71,7 @@ static bool nf_osf_match_one(const struct sk_buff *skb,
 			     int ttl_check,
 			     struct nf_osf_hdr_ctx *ctx)
 {
+	const __u8 *optpinit = ctx->optp;
 	unsigned int check_WSS = 0;
 	int fmatch = FMATCH_WRONG;
 	int foptsize, optnum;
@@ -160,6 +161,9 @@ static bool nf_osf_match_one(const struct sk_buff *skb,
 		}
 	}
 
+	if (fmatch != FMATCH_OK)
+		ctx->optp = optpinit;
+
 	return fmatch == FMATCH_OK;
 }