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Added GIF decompression bomb check

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This commit is contained in:
Andrew Murray 2022-06-30 12:47:35 +10:00
parent 8f35234f3a
commit c9f1b35e98
3 changed files with 6 additions and 0 deletions
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Tests/images/decompression_bomb_extents.gif Normal file
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Width:  |  Height:  |  Size: 368 B

5
Tests/test_decompression_bomb.py
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@ -61,6 +61,11 @@ class TestDecompressionBomb:
with Image.open("Tests/images/decompression_bomb.gif"):
pass
def test_exception_gif_extents(self):
with Image.open("Tests/images/decompression_bomb_extents.gif") as im:
with pytest.raises(Image.DecompressionBombError):
im.seek(1)
def test_exception_bmp(self):
with pytest.raises(Image.DecompressionBombError):
with Image.open("Tests/images/bmp/b/reallybig.bmp"):

1
src/PIL/GifImagePlugin.py
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@ -265,6 +265,7 @@ class GifImageFile(ImageFile.ImageFile):
x1, y1 = x0 + i16(s, 4), y0 + i16(s, 6)
if (x1 > self.size[0] or y1 > self.size[1]) and update_image:
self._size = max(x1, self.size[0]), max(y1, self.size[1])
Image._decompression_bomb_check(self._size)
frame_dispose_extent = x0, y0, x1, y1
flags = s[8]