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The decoding expected a frame to exist by unwrapping its option but an image that ends directly (in 4 bytes) will trip this condition.
wartmanm
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Oct 4, 2021
Issue image 1410 panic
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Fix: image-rs/image#1410
The end of the loop can be reached without having read any frame. Then the
frameis stillNoneand we mustn't unwrap the reference we take.