added parsing checks

diff --git a/src/libcharon/plugins/tnccs_20/messages/pb_reason_string_message.c b/src/libcharon/plugins/tnccs_20/messages/pb_reason_string_message.c
index 5a0a9ba505c8ddbb661d4c1748e93427d7770c19..1cfbb60bd5c24166f2689ad2ce40c73c0b0a06bd 100644 (file)
--- a/src/libcharon/plugins/tnccs_20/messages/pb_reason_string_message.c
+++ b/src/libcharon/plugins/tnccs_20/messages/pb_reason_string_message.c
@@ -103,8 +103,6 @@ METHOD(pb_tnc_message_t, process, status_t,
        private_pb_reason_string_message_t *this)
 {
        tls_reader_t *reader;
-       u_int32_t reason_string_length;
-       u_int8_t language_code_length;
 
        if (this->encoding.len < REASON_STRING_HEADER_SIZE)
        {
@@ -116,12 +114,18 @@ METHOD(pb_tnc_message_t, process, status_t,
 
        /* process message */
        reader = tls_reader_create(this->encoding);
-       reader->read_uint32(reader, &reason_string_length);
-       reader->read_data(reader, reason_string_length, &this->reason_string);
+       if (!reader->read_data32(reader, &this->reason_string))
+       {
+               DBG1(DBG_TNC, "Could not parse reason string");
+               return FAILED;
+       };
        this->reason_string = chunk_clone(this->reason_string);
 
-       reader->read_uint8(reader, &language_code_length);
-       reader->read_data(reader, language_code_length, &this->language_code);
+       if (!reader->read_data8(reader, &this->language_code))
+       {
+               DBG1(DBG_TNC, "Could not parse language code");
+               return FAILED;
+       };
        this->language_code = chunk_clone(this->language_code);
 
        reader->destroy(reader);