check length before dereferencing it

diff --git a/src/protocols/dhcpv4/packet.c b/src/protocols/dhcpv4/packet.c
index 89923311f5cad5b3e66252c8c3349f7d360ed06f..ae2e116021ea1063329b0c76baea81e0e085fa8f 100644 (file)
--- a/src/protocols/dhcpv4/packet.c
+++ b/src/protocols/dhcpv4/packet.c
@@ -92,7 +92,7 @@ uint8_t const *fr_dhcpv4_packet_get_option(dhcp_packet_t const *packet, size_t p
 
                if (data[0] == da->attr) return data;
 
-               if (data[0] == 52) { /* overload sname and/or file */
+               if ((data[0] == 52) && (data[1] > 0)) { /* overload sname and/or file */
                        overload = data[2];
                }