udhcpc: when decoding DHCP_SUBNET, ensure it is 4 bytes long

function                                             old     new   delta
udhcp_run_script                                     795     801      +6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 4c2221b77..fc4de5716 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -302,7 +302,7 @@ uint8_t* FAST_FUNC udhcp_get_option32(struct dhcp_packet *packet, int code)
 {
         uint8_t *r = udhcp_get_option(packet, code);
         if (r) {
-                if (r[-1] != 4)
+                if (r[-OPT_DATA + OPT_LEN] != 4)
                         r = NULL;
         }
         return r;