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Fix /upload 500'ing when presented a very large image (#10029)

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* Fix /upload 500'ing when presented a very large image

Catch DecompressionBombError and re-raise as ThumbnailErrors

* Set PIL's MAX_IMAGE_PIXELS to match homeserver.yaml

to get it to bomb out quicker, to load less into memory
in the case of super large images

* Add changelog entry for 10029
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Michael Telatynski 2021-05-21 17:31:59 +01:00 • committed by GitHub
parent 21bd230831
commit e8ac9ac8ca
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synapse/rest/media/v1/thumbnailer.py
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@ -40,6 +40,10 @@ class Thumbnailer:
FORMATS = {"image/jpeg": "JPEG", "image/png": "PNG"}
@staticmethod
def set_limits(max_image_pixels: int):
Image.MAX_IMAGE_PIXELS = max_image_pixels
def __init__(self, input_path: str):
try:
self.image = Image.open(input_path)
@ -47,6 +51,11 @@ class Thumbnailer:
# If an error occurs opening the image, a thumbnail won't be able to
# be generated.
raise ThumbnailError from e
except Image.DecompressionBombError as e:
# If an image decompression bomb error occurs opening the image,
# then the image exceeds the pixel limit and a thumbnail won't
# be able to be generated.
raise ThumbnailError from e
self.width, self.height = self.image.size
self.transpose_method = None