Gif_Context->decodepos = 0, segfault

[newfurniturey]

If 0x0000 is written to specific offsets that populate the Gif_Context->decodepos position, there will be a segmentation fault caused by a buffer underrun in gifread.c:350:

gfc->image[gfc->decodepos - 1] = gfc->suffix[next_code];

Sometimes the images are valid gifs that will display in most browsers / previewers, other times they will fail to display entirely. One of each is are linked below.

Sample images:
http://i.imgur.com/o9wE74W.gif
http://i.imgur.com/s0lTXwq.gif

[kohler]

Thanks!! This should be fixed. Although the image appears valid it has a zero-width frame.