xpdf/poppler: SplashBitmap integer overflow

Integer overflow in the JBIG2 decoding feature in the SplashBitmap::SplashBitmap function in SplashBitmap.cc in Xpdf 3.x before 3.02pl4 and Poppler before 0.10.6, as used in GPdf and kdegraphics KPDF, allows remote attackers to execute arbitrary code or cause a denial of service application crash...