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Merge pull request #2813 from wiredfool/issue_2811

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Permit LZW code lengths up to 12 bits in GIF decode
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wiredfool 2017-11-05 15:02:41 +00:00 committed by GitHub
commit f5e4338b86
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3 changed files with 8 additions and 1 deletions
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Tests/images/issue_2811.gif Normal file
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7
Tests/test_file_gif.py
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@ -546,6 +546,13 @@ class TestFileGif(PillowTestCase):
finally: finally:
GifImagePlugin._FORCE_OPTIMIZE = False GifImagePlugin._FORCE_OPTIMIZE = False
def test_lzw_bits(self):
# see https://github.com/python-pillow/Pillow/issues/2811
im = Image.open('Tests/images/issue_2811.gif')
self.assertEqual(im.tile[0][3][0], 11) # LZW bits
# codec error prepatch
im.load()
if __name__ == '__main__': if __name__ == '__main__':
unittest.main() unittest.main()

2
libImaging/GifDecode.c
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@ -71,7 +71,7 @@ ImagingGifDecode(Imaging im, ImagingCodecState state, UINT8* buffer, int bytes)
if (!state->state) { if (!state->state) {
/* Initialise state */ /* Initialise state */
if (context->bits < 0 || context->bits > 8) { if (context->bits < 0 || context->bits > 12) {
state->errcode = IMAGING_CODEC_CONFIG; state->errcode = IMAGING_CODEC_CONFIG;
return -1; return -1;
} }