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Reject format spec with width above i32::MAX #7707

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Merged
youknowone merged 1 commit into from
Apr 28, 2026
Merged

Reject format spec with width above i32::MAX #7707

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1 change: 0 additions & 1 deletion Lib/test/test_str.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1463,7 +1463,6 @@ def test_format_huge_precision(self):
with self.assertRaises(ValueError):
result = format(2.34, format_string)

@unittest.expectedFailure # TODO: RUSTPYTHON; AssertionError: ValueError not raised
def test_format_huge_width(self):
format_string = "{}f".format(sys.maxsize + 1)
with self.assertRaises(ValueError):
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5 changes: 5 additions & 0 deletions crates/common/src/format.rs
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Expand Up @@ -315,6 +315,11 @@ impl FormatSpec {
let (alternate_form, text) = parse_alternate_form(text);
let (zero, text) = parse_zero(text);
let (width, text) = parse_number(text)?;
if let Some(w) = width
&& w > i32::MAX as usize
{
return Err(FormatSpecError::DecimalDigitsTooMany);
}
let (grouping_option, text) = FormatGrouping::parse(text);
if let Some(grouping) = &grouping_option {
Self::validate_separator(grouping, text)?;
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