Fix a promotion caught with gcc -fsanitize=undefined.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/dhcp.c b/src/dhcp.c
index 83c997b3..7a6749d4 100644
--- a/src/dhcp.c
+++ b/src/dhcp.c
@@ -3267,7 +3267,7 @@ get_udp_data(void *udp, size_t *len)
 	struct bootp_pkt *p;
 
 	p = (struct bootp_pkt *)udp;
-	*len = ntohs(p->ip.ip_len) - sizeof(p->ip) - sizeof(p->udp);
+	*len = (size_t)ntohs(p->ip.ip_len) - sizeof(p->ip) - sizeof(p->udp);
 	return (char *)udp + offsetof(struct bootp_pkt, bootp);
 }