#77 Slow to run on some crafted images

[Hongxu Chen]

It may take too much time to run optipng on some crafted images whose metadata is bogus; this results from the fact optipng may allocate the corresponding memory for these declared values. The consequence is that it consumes quite a lot of memory and greatly affects the overall performance of the computer.

[Hongxu Chen]

Please see the attached input files for reference.

[Hongxu Chen]

seems that gifs cannot be uploaded. Please follow the following links:
https://github.com/ntu-sec/pocs/blob/master/optipng-0.7.7/hangs/s01.gif
https://github.com/ntu-sec/pocs/blob/master/optipng-0.7.7/hangs/s02.gif