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Merge pull request #6510 from radarhere/buffer

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Hugo van Kemenade 2022-08-31 13:50:35 +03:00 committed by GitHub
commit b607e834a9
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3 changed files with 10 additions and 0 deletions
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Tests/images/mmap_error.bmp Normal file
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7
Tests/test_file_bmp.py
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@ -39,6 +39,13 @@ def test_invalid_file():
BmpImagePlugin.BmpImageFile(fp)
def test_fallback_if_mmap_errors():
# This image has been truncated,
# so that the buffer is not large enough when using mmap
with Image.open("Tests/images/mmap_error.bmp") as im:
assert_image_equal_tofile(im, "Tests/images/pal8_offset.bmp")
def test_save_to_bytes():
output = io.BytesIO()
im = hopper()

3
src/PIL/ImageFile.py
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@ -192,6 +192,9 @@ class ImageFile(Image.Image):
with open(self.filename) as fp:
self.map = mmap.mmap(fp.fileno(), 0, access=mmap.ACCESS_READ)
if offset + self.size[1] * args[1] > self.map.size():
# buffer is not large enough
raise OSError
self.im = Image.core.map_buffer(
self.map, self.size, decoder_name, offset, args
)