udhcpc: ignore zero-length DHCP options, take 2

advance the optionptr by two bytes, not one

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

1 files changed, 3 insertions, 3 deletions

diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 99ecb7aa6..f2d6907ad 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -282,11 +282,11 @@ uint8_t* FAST_FUNC udhcp_scan_options(struct dhcp_packet *packet, struct dhcp_sc
                  * (this violates RFC 2132 section 3.14).
                  */
                 if (len == 0) {
-                        scan_state->rem -= OPT_LEN;
-                        scan_state->optionptr += OPT_LEN;
+                        scan_state->rem -= 2;
+                        scan_state->optionptr += 2;
                         continue;
                 }
-                len += OPT_LEN;
+                len += 2;
                 scan_state->rem -= len;
                 if (scan_state->rem < 0) /* option is longer than options field? */
                         goto complain; /* yes, complain and return NULL */