[PATCH net-next v2 2/3] netfilter: nf_conntrack_irc: use nf_ct_helper_parse_port()

[HACKE-RC <rc@rexion.ai>]

Replace the bare simple_strtoul() call for port parsing with the
shared nf_ct_helper_parse_port(). This avoids reliance on the
nul-terminated string guarantee (currently provided by the newline
scan earlier in parse_dcc) and validates the port fits in u16.

The simple_strtoul() for the IP address field is left as-is since
it returns unsigned long for a __be32 conversion, which is a
separate concern.

Fixes: 869f37d8e48f ("[NETFILTER]: nf_conntrack/nf_nat: add IRC helper port")
Signed-off-by: HACKE-RC <rc@rexion.ai>
---
 net/netfilter/nf_conntrack_irc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c
index 522183b9a..1b51f5a6a 100644
--- a/net/netfilter/nf_conntrack_irc.c
+++ b/net/netfilter/nf_conntrack_irc.c
@@ -93,7 +93,9 @@ static int parse_dcc(char *data, const char *data_end, __be32 *ip,
 		data++;
 	}
 
-	*port = simple_strtoul(data, &data, 10);
+	if (nf_ct_helper_parse_port(data, data_end - data, port, &data))
+		return -1;
+
 	*ad_end_p = data;
 
 	return 0;
-- 
2.54.0