Gdk-pixbuf: uninitialized memory disclosure in gdkpixbuf gif lzw decoder

A flaw was found in the GIF parser of GdkPixbuf’s LZW decoder. When aninvalid symbol is encountered during decompression, the decoder sets thereported output size to the full buffer length rather than the actualnumber of written bytes. This logic error results in uninitialized sectionsof the buffer being included in the output, potentially leaking arbitrarymemory contents in the processed image.

Where it's fixed