ImageMagick: Out-of-Bounds Read in connected components when the user supplies an invalid keep-top define

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 6.9.13-48 and 7.1.2-22, an invalid connected-components:keep-top value could result in a heap buffer over-read when performing the connected components operation. This issue has been patched in versions 6.9.13-48 and 7.1.2-22.