The sycc422_to_rgb function in fxcodec/codec/fx_codec_jpx_opj.cpp in PDFium, as used in Google Chrome before 40.0.2214.91, does not properly handle odd values of image width, which allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted PDF document.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.