Description: netfilter: nf_conntrack_irc: Tighten matching on DCC message
References:
 https://www.openwall.com/lists/oss-security/2022/08/30/1
 https://lore.kernel.org/netfilter-devel/20220826045658.100360-1-dgl@dgl.cx/T/
 https://dgl.cx/2022/08/nat-again-irc-cve-2022-2663
Notes:
 carnil> For 5.19.y fixed as well in 5.19.9.
 bwh> There are two related fixes that seem to share this single
 bwh> CVE ID, but for some reason they weren't applied together.
 bwh> Second was applied in 5.19.12.
Bugs:
upstream: released (6.0-rc5) [0efe125cfb99e6773a7434f3463f7c2fa28f3a43], released (6.0-rc7) [e8d5dfd1d8747b56077d02664a8838c71ced948e]
5.10-upstream-stable: released (5.10.143) [e12ce30fe593dd438c5b392290ad7316befc11ca], released (5.10.146) [9a5d7e0acb41bb2aac552f8eeb4b404177f3f66d]
4.19-upstream-stable: released (4.19.258) [3275f7804f40de3c578d2253232349b07c25f146], released (4.19.260) [468adf7aab7a30ffe4467e2c981a65568ba84f0b]
sid: released (5.19.11-1), released (6.0.2-1)
5.10-bullseye-security: released (5.10.148-1)
4.19-buster-security: released (4.19.260-1)