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Use mmap instead of built-in Win32 mapper #5224

merged 4 commits into from Mar 7, 2021


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@radarhere radarhere commented Jan 25, 2021

Resolves #5221, as reported by the user who created that issue.

Recreated version of #4310, since it needed to be rebased and the Pillow repository from @cgohlke has disappeared.

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raygard commented Jan 26, 2021

See for a test. I don't know how this needs to be set up for CI testing, etc. But it does demonstrate the before/after behavior you need.

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I have added a test, using the initial comment in #5221

By itself, this test causes a 'Windows fatal exception: access violation'.

With the change from this PR, it passes.

@hugovk hugovk merged commit f15f573 into python-pillow:master Mar 7, 2021
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hugovk commented Mar 7, 2021

Thanks all!

@radarhere radarhere deleted the mapper branch March 7, 2021 21:02
@radarhere radarhere changed the title Do not use "use built-in mapper WIN32 only" Use mmap instead of built-in Win32 mapper Mar 8, 2021
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Successfully merging this pull request may close these issues.

Win32: map.c integer overflow crashes PIL in tobytes()
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