omertt27 opened a new issue, #50135:
URL: https://github.com/apache/arrow/issues/50135
### Describe the bug, including details regarding any error messages,
version, and platform.
Decimal{32,64,128,256}::FromString parse the exponent with
ParseValue<Int32Type>, so it can be any int32_t including INT32_MIN.
DecimalFromString/SimpleDecimalFromString in cpp/src/arrow/util/decimal.cc then
compute parsed_scale = -adjusted_exponent + fractional_digits. For an input
like 0E-2147483648 the negation of INT32_MIN is signed-integer-overflow UB; a
near-INT32_MIN exponent overflows the addition.
UBSan on the expression:
decimal.cc: runtime error: negation of -2147483648 cannot be represented in
type 'int32_t' (aka 'int')
These are public string-parsing entry points reachable from the CSV/JSON
readers when converting decimal columns, so the input crosses a trust boundary.
### Component(s)
C++
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