- if ((EXTRACT_U_1(p) & MFR_BEC_MASK) == MFR_CTRL_FRAME && EXTRACT_U_1(p + 1) == 0) {
- ND_PRINT((ndo, "FRF.16 Control, Flags [%s], %s, length %u",
- bittok2str(frf_flag_values,"none",(EXTRACT_U_1(p) & MFR_BEC_MASK)),
- tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",EXTRACT_U_1(p + 2)),
- length));
+ if (length < 4) { /* minimum frame header length */
+ ND_PRINT("[length %u < 4]", length);
+ nd_print_invalid(ndo);
+ return length;
+ }
+ ND_TCHECK_4(p);
+
+ if ((GET_U_1(p) & MFR_BEC_MASK) == MFR_CTRL_FRAME && GET_U_1(p + 1) == 0) {
+ ND_PRINT("FRF.16 Control, Flags [%s], %s, length %u",
+ bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)),
+ tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",GET_U_1(p + 2)),
+ length);