releases/4.9.124/netfilter-x_tables-set-module-owner-for-icmp-6-matches.patch

From foo@baz Wed Aug 22 09:42:09 CEST 2018
From: Florian Westphal <fw@strlen.de>
Date: Wed, 4 Jul 2018 20:25:32 +0200
Subject: netfilter: x_tables: set module owner for icmp(6) matches

From: Florian Westphal <fw@strlen.de>

[ Upstream commit d376bef9c29b3c65aeee4e785fffcd97ef0a9a81 ]

nft_compat relies on xt_request_find_match to increment
refcount of the module that provides the match/target.

The (builtin) icmp matches did't set the module owner so it
was possible to rmmod ip(6)tables while icmp extensions were still in use.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/netfilter/ip_tables.c  |    1 +
 net/ipv6/netfilter/ip6_tables.c |    1 +
 2 files changed, 2 insertions(+)

--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1913,6 +1913,7 @@ static struct xt_match ipt_builtin_mt[]
 		.checkentry = icmp_checkentry,
 		.proto      = IPPROTO_ICMP,
 		.family     = NFPROTO_IPV4,
+		.me	    = THIS_MODULE,
 	},
 };
 
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1934,6 +1934,7 @@ static struct xt_match ip6t_builtin_mt[]
 		.checkentry = icmp6_checkentry,
 		.proto      = IPPROTO_ICMPV6,
 		.family     = NFPROTO_IPV6,
+		.me	    = THIS_MODULE,
 	},
 };