gif: Fix LZW decoder accepting invalid LZW code.
The code value after a reset wasn't being validated, which means we would accept invalid codes. This could cause an infinite loop in the decoder.
Fixes CVE-2020-29385
Fixes #164 (closed)
The code value after a reset wasn't being validated, which means we would accept invalid codes. This could cause an infinite loop in the decoder.
Fixes CVE-2020-29385
Fixes #164 (closed)