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Fix decoding empty array of complex type in RPM

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This commit is contained in:
Ondřej Hruška
2023-10-20 15:27:44 +02:00
parent 0b5474d36e
commit 3870bb3826
1 changed files with 43 additions and 34 deletions
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src/bacnet/basic/service/h_rpm_a.c
+43 -34
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@@ -118,40 +118,49 @@ int rpm_ack_decode_service_request(
more than one element to decode */
value = calloc(1, sizeof(BACNET_APPLICATION_DATA_VALUE));
rpm_property->value = value;
while (value && (apdu_len > 0)) {
len = bacapp_decode_known_property(apdu, (unsigned)apdu_len,
value, rpm_object->object_type,
rpm_property->propertyIdentifier);
/* If len == 0 then it's an empty structure, which is OK. */
if (len < 0) {
/* problem decoding */
PERROR("RPM Ack: unable to decode! %s:%s\n",
bactext_object_type_name(rpm_object->object_type),
bactext_property_name(
rpm_property->propertyIdentifier));
/* note: caller will free the memory */
return BACNET_STATUS_ERROR;
}
decoded_len += len;
apdu_len -= len;
apdu += len;
if (apdu_len && decode_is_closing_tag_number(apdu, 4)) {
decoded_len++;
apdu_len--;
apdu++;
break;
} else if (len > 0) {
old_value = value;
value =
calloc(1, sizeof(BACNET_APPLICATION_DATA_VALUE));
old_value->next = value;
} else {
PERROR("RPM Ack: decoded %s:%s len=%d\n",
bactext_object_type_name(rpm_object->object_type),
bactext_property_name(
rpm_property->propertyIdentifier),
len);
break;
/* Special case for an empty array - we decode it as null */
if (apdu_len && decode_is_closing_tag_number(apdu, 4)) {
/* NULL value has tag 0, that was already set by calloc */
decoded_len++;
apdu_len--;
apdu++;
} else {
while (value && (apdu_len > 0)) {
len = bacapp_decode_known_property(apdu, (unsigned)apdu_len,
value, rpm_object->object_type,
rpm_property->propertyIdentifier);
/* If len == 0 then it's an empty structure, which is OK. */
if (len < 0) {
/* problem decoding */
PERROR("RPM Ack: unable to decode! %s:%s\n",
bactext_object_type_name(rpm_object->object_type),
bactext_property_name(
rpm_property->propertyIdentifier));
/* note: caller will free the memory */
return BACNET_STATUS_ERROR;
}
decoded_len += len;
apdu_len -= len;
apdu += len;
if (apdu_len && decode_is_closing_tag_number(apdu, 4)) {
decoded_len++;
apdu_len--;
apdu++;
break;
} else if (len > 0) {
old_value = value;
value =
calloc(1, sizeof(BACNET_APPLICATION_DATA_VALUE));
old_value->next = value;
} else {
PERROR("RPM Ack: decoded %s:%s len=%d\n",
bactext_object_type_name(rpm_object->object_type),
bactext_property_name(
rpm_property->propertyIdentifier),
len);
break;
}
}
}
} else if (apdu_len && decode_is_opening_tag_number(apdu, 5)) {