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Stuck in LockSemaphoreInfo after reading a png with width==MAGICK_WIDTH_LIMIT #596

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@jdelStrother

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@jdelStrother

Hi there - I've discovered a potential DOS vulnerability in ImageMagick 6.9 (but not 7) when dealing with PNGs. Is there a security-reporting email I should contact, or shall I just post it here?

[Edit: updated the title to be more descriptive, given the bug is fully described below]

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