diff --git a/lib/ipmi_lanp.c b/lib/ipmi_lanp.c
index 11e0d9c..1357ffb 100644
--- a/lib/ipmi_lanp.c
+++ b/lib/ipmi_lanp.c
@@ -1255,9 +1255,16 @@ static int
 get_cmdline_ipaddr(char * arg, uint8_t * buf)
 {
 	uint32_t ip1, ip2, ip3, ip4;
-	if (sscanf(arg, "%d.%d.%d.%d", &ip1, &ip2, &ip3, &ip4) != 4) {
+	if (sscanf(arg,
+				"%" PRIu32 ".%" PRIu32 ".%" PRIu32 ".%" PRIu32,
+				&ip1, &ip2, &ip3, &ip4) != 4) {
 		lprintf(LOG_ERR, "Invalid IP address: %s", arg);
-		return -1;
+		return (-1);
+	}
+	if (ip1 > UINT8_MAX || ip2 > UINT8_MAX
+			|| ip3 > UINT8_MAX || ip4 > UINT8_MAX) {
+		lprintf(LOG_ERR, "Invalid IP address: %s", arg);
+		return (-1);
 	}
 	buf[0] = (uint8_t)ip1;
 	buf[1] = (uint8_t)ip2;