ImageMagick: Integer overflow or wraparound and incorrect conversion between numeric types in the internal SVG decoder

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-15 and 6.9.13-40, a crafted SVG file can cause a denial of service. An off-by-one boundary check (> instead of >=) that allows bypass the guard and reach an undefined (size_t) cast. Versions 7.1.2-15 and 6.9.13-40 contain a patch.