fix: prevent shift overflow panic in ColorMap size validation

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`1usize << bits_per_sample` panics when bits_per_sample >= 64.
Use checked_shl to return a LimitsExceeded error instead.

Found by fuzzing decode_comprehensive with a BE TIFF containing
PhotometricInterpretation=RGBPalette and BitsPerSample=83.

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Lilith River committed 2026-04-09 04:46:05 -06:00

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commit 26b18c5184

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tests/fuzz_images/oor_panic/colormap-shl-overflow.tiff

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