cairo through 1.15.14 has an out-of-bounds stack-memory write during processing of a crafted documen...

cairo through 1.15.14 has an out-of-bounds stack-memory write during processing of a crafted document by WebKitGTK+ because of the interaction between cairo-rectangular-scan-converter.c (the generate and renderrows functions) and cairo-image-compositor.c (the _cairoimagespansand_zero function).