libpng: regression of CVE-2004-0421 in 1.2.23+

The pngformatbuffer function in pngerror.c in libpng 1.0.x before 1.0.55, 1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4 allows remote attackers to cause a denial of service application crash via a crafted PNG image that triggers an out-of-bounds read during the copying of...