[FFmpeg-devel] [PATCH] avcodec/webp: validate the distance prefix code

[Andreas Cadhalpun]

Hi,

according to the WebP Lossless Bitstream Specification [1] the highest allowed 
value for the prefix code is 39. Attached patch adds a check for this to avoid 
crashes decoding broken files.

Best regards,
Andreas


1: 
https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification#4_image_data 

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