Division or modulo by zero results in undefined behavior.

Defect 21944 (STATIC_C)
Checker DIVIDE_BY_ZERO (subcategory none)
File: /src/mongo/scripting/bson_template_evaluator.cpp
Function mongo::BsonTemplateEvaluator::evalSeqInt(mongo::BsonTemplateEvaluator*, const char *, const mongo::BSONObj &, mongo::BSONObjBuilder &)
/src/mongo/scripting/bson_template_evaluator.cpp, line: 240
Assigning: "modval" = "spec[mongo::StringData("mod")].numberInt()". The value of "modval" is now 0.

            int modval = spec["mod"].numberInt();

/src/mongo/scripting/bson_template_evaluator.cpp, line: 241
In expression "curr_seqval % modval", modulo by expression "modval" which may be zero has undefined behavior.

            curr_seqval = (curr_seqval % modval);