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dtls.c: Reject oversized fragment length #63

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dtls.c: Reject oversized fragment length #63

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6 changes: 5 additions & 1 deletion dtls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3675,7 +3675,11 @@ handle_handshake(dtls_context_t *ctx, dtls_peer_t *peer, session_t *session,
size_t fragment_length = dtls_uint24_to_int(hs_header->fragment_length);
size_t fragment_offset = dtls_uint24_to_int(hs_header->fragment_offset);

if (packet_length > fragment_length){
if (fragment_length > packet_length) {
dtls_warn("fragment length > header length\n");
return dtls_alert_fatal_create(DTLS_ALERT_DECODE_ERROR);
}
else if (packet_length > fragment_length){
dtls_debug("received fragmented handshake packet: length %zu, fragment length %zu.\n",
packet_length, fragment_length);
/* If (reassembled) packet is larger than our buffer, drop with error */
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