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Do not allow TIFF to seek to a past frame #5473

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merged 1 commit into from Jun 5, 2021

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@radarhere radarhere commented May 7, 2021

Resolves #5472

The issue provides a TIFF image where the seek position of the next frame is the same as the current frame, leading to an infinite loop.

This PR changes the code so that if the next frame has already been processed, it takes that to mean there are no more images.

@radarhere radarhere added the TIFF label May 7, 2021
@radarhere radarhere force-pushed the tiff_seek branch 2 times, most recently from d254ef6 to 80c3020 Compare May 7, 2021 14:14
@radarhere radarhere changed the title Ensure that TIFF can only seek forward for the next frame Fix an infinite loop when checking number of TIFF frames May 7, 2021
@radarhere radarhere changed the title Fix an infinite loop when checking number of TIFF frames Do not allow TIFF to seek to a past frame May 7, 2021
@hugovk hugovk merged commit 1ac7bd9 into python-pillow:master Jun 5, 2021
@radarhere radarhere deleted the tiff_seek branch June 6, 2021 11:15
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Indefinite loop while counting frames in truncated tiff image
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