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[fix] PicDocument: Pass a copy of image_bb in getCoverPageImage() (#4628)
Avoids a use-after-free in mupdf.scaleBlitBuffer Fix koreader/koreader-base#821 Thanks for the hint, @poire-z ;). * As @poire-z suggested, the original unscaled bb should probably be free'd.pull/4633/head
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