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bpo-35474: Fix mimetypes.guess_all_extensions() potentially mutating list (GH-28286) (GH-28290)

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* Calling guess_all_extensions() with strict=False potentially
  mutated types_map_inv.
* Mutating the result of guess_all_extensions() mutated types_map_inv.
(cherry picked from commit 97ea18eced)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2021-09-13 10:24:08 -07:00 • committed by GitHub
parent 218fe2cb79
commit 9cd8fb8d63
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3 changed files with 20 additions and 8 deletions
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Lib/mimetypes.py
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@ -169,7 +169,7 @@ class MimeTypes:
but non-standard types.
"""
type = type.lower()
extensions = self.types_map_inv[True].get(type, [])
extensions = list(self.types_map_inv[True].get(type, []))
if not strict:
for ext in self.types_map_inv[False].get(type, []):
if ext not in extensions: