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Don't use list as default in PdfParser read_prev_trailer (#9629)

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Hugo van Kemenade 2026-05-14 14:09:33 +03:00 committed by GitHub
commit e7556b19b7
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1 changed files with 3 additions and 1 deletions
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src/PIL/PdfParser.py
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@ -692,7 +692,7 @@ class PdfParser:
self.read_prev_trailer(self.trailer_dict[b"Prev"])
def read_prev_trailer(
self, xref_section_offset: int, processed_offsets: list[int] = []
self, xref_section_offset: int, processed_offsets: list[int] | None = None
) -> None:
assert self.buf is not None
trailer_offset = self.read_xref_table(xref_section_offset=xref_section_offset)
@ -708,6 +708,8 @@ class PdfParser:
)
trailer_dict = self.interpret_trailer(trailer_data)
if b"Prev" in trailer_dict:
if processed_offsets is None:
processed_offsets = []
processed_offsets.append(xref_section_offset)
check_format_condition(
trailer_dict[b"Prev"] not in processed_offsets, "trailer loop found"