From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 27 May 2020 12:17:34 +0200
Subject: netfilter: conntrack: comparison of unsigned in cthelper confirmation
Patch-mainline: v5.7
Git-commit: 94945ad2b330207cded0fd8d4abebde43a776dfb
References: bsc#1176447

net/netfilter/nf_conntrack_core.c: In function nf_confirm_cthelper:
net/netfilter/nf_conntrack_core.c:2117:15: warning: comparison of unsigned expression in < 0 is always false [-Wtype-limits]
 2117 |   if (protoff < 0 || (frag_off & htons(~0x7)) != 0)
      |               ^

ipv6_skip_exthdr() returns a signed integer.

Reported-by: Colin Ian King <colin.king@canonical.com>
Fixes: 703acd70f249 ("netfilter: nfnetlink_cthelper: unbreak userspace helper support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/netfilter/nf_conntrack_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -2092,7 +2092,7 @@ static int nf_confirm_cthelper(struct sk
 {
 	const struct nf_conntrack_helper *helper;
 	const struct nf_conn_help *help;
-	unsigned int protoff;
+	int protoff;
 
 	help = nfct_help(ct);
 	if (!help)