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Raise ValueError if seeking to greater than offset-sized integer in TIFF #7883

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merged 1 commit into from Apr 1, 2024
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Raise ValueError if seeking to greater than offset-sized integer in TIFF #7883

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Binary file added Tests/images/seek_too_large.tif
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4 changes: 4 additions & 0 deletions Tests/test_file_tiff.py
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Expand Up @@ -113,6 +113,10 @@ def test_bigtiff(self, tmp_path: Path) -> None:
outfile = str(tmp_path / "temp.tif")
im.save(outfile, save_all=True, append_images=[im], tiffinfo=im.tag_v2)

def test_seek_too_large(self):
with pytest.raises(ValueError, match="Unable to seek to frame"):
Image.open("Tests/images/seek_too_large.tif")

def test_set_legacy_api(self) -> None:
ifd = TiffImagePlugin.ImageFileDirectory_v2()
with pytest.raises(Exception) as e:
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3 changes: 3 additions & 0 deletions src/PIL/TiffImagePlugin.py
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Expand Up @@ -1166,6 +1166,9 @@ def _seek(self, frame):
self.__next,
self.fp.tell(),
)
if self.__next >= 2**63:
msg = "Unable to seek to frame"
raise ValueError(msg)
self.fp.seek(self.__next)
self._frame_pos.append(self.__next)
logger.debug("Loading tags, location: %s", self.fp.tell())
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