parameters: require valid BSON document size

src/lib/parameters/parameters.cpp

@@ -1355,7 +1355,13 @@ static int param_verify(int fd)
 		} while (result > 0);
 
 		if (result == 0) {
+			if (decoder.total_document_size != decoder.total_decoded_size) {
+				PX4_ERR("BSON document size (%" PRId32 ") doesn't match bytes decoded (%" PRId32 ")", decoder.total_document_size,
+					decoder.total_decoded_size);
+
+			} else {
 				return 0;
+			}
 
 		} else if (result == -ENODATA) {
 			PX4_ERR("verify: no BSON data");
@@ -1613,12 +1619,18 @@ param_import_internal(int fd)
 			} while (result > 0);
 
 			if (result == 0) {
+				if (decoder.total_document_size == decoder.total_decoded_size) {
 					PX4_INFO("BSON document size %" PRId32 " bytes, decoded %" PRId32 " bytes (INT32:%" PRIu16 ", FLOAT:%" PRIu16 ")",
 						 decoder.total_document_size, decoder.total_decoded_size,
 						 decoder.count_node_int32, decoder.count_node_double);
 
 					return 0;
 
+				} else {
+					PX4_ERR("BSON document size (%" PRId32 ") doesn't match bytes decoded (%" PRId32 ")",
+						decoder.total_document_size, decoder.total_decoded_size);
+				}
+
 			} else if (result == -ENODATA) {
 				// silently retry as a precaution unless this is our last attempt
 				if (attempt == MAX_ATTEMPTS) {