| Description: |
From the Red Hat bugzilla:
GIF image file format readers in various open source projects are based on the GIF decoder implementation written by David Koblas. This implementation contains a bug in the LZW decompressor, causing it to incorrectly handle compressed streams that contain code words that were not yet added to the decompression table. LZW decompression has a special case (a KwKwK string) when code word may match the first free entry in the decompression table. The implementation used in this GIF reading code allows code words not only matching, but also exceeding the first free entry.
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