pitrou commented on a change in pull request #7987:
URL: https://github.com/apache/arrow/pull/7987#discussion_r473907662
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File path: cpp/src/arrow/python/python_to_arrow.cc
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@@ -263,7 +264,12 @@ struct ValueConverter<TimestampType> {
value = internal::PyDateTime_to_us(dt) - offset * 1000 * 1000;
break;
case TimeUnit::NANO:
- value = internal::PyDateTime_to_ns(dt) - offset * 1000 * 1000 * 1000;
+ // Conversion to nanoseconds can overflow -> check multiply of
microseconds
+ value = internal::PyDateTime_to_us(dt);
+ if (arrow::internal::MultiplyWithOverflow(value, 1000, &value)) {
+ return internal::InvalidValue(obj, "out of bounds for nanosecond
resolution");
+ }
+ value -= offset * 1000 * 1000 * 1000;
Review comment:
This subtraction could overflow as well, no?
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