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Check all reserved bytes in FLI header (#9183)

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Hugo van Kemenade 2025-10-04 11:02:10 +03:00 committed by GitHub
commit a2e2939240
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4 changed files with 6 additions and 1 deletions
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Tests/images/crash-5762152299364352.fli
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Tests/images/timeout-9139147ce93e20eb14088fe238e541443ffd64b3.fli
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Tests/images/timeout-bff0a9dc7243a8e6ede2408d2ffa6a9964698b87.fli
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src/PIL/FliImagePlugin.py
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@ -49,7 +49,12 @@ class FliImageFile(ImageFile.ImageFile):
def _open(self) -> None:
# HEAD
s = self.fp.read(128)
if not (_accept(s) and s[20:22] == b"\x00\x00"):
if not (
_accept(s)
and s[20:22] == b"\x00" * 2
and s[42:80] == b"\x00" * 38
and s[88:] == b"\x00" * 40
):
msg = "not an FLI/FLC file"
raise SyntaxError(msg)