openjpeg: code execution

From the Red Hat bug report:

An out-of heap-based buffer bounds read and write flaw, leading to invalid free, was found in the way a tile coder / decoder (TCD) implementation of OpenJPEG, an open-source JPEG 2000 codec written in C language, performed releasing of previously allocated memory for the TCD encoder handle by processing certain Gray16 TIFF images. A remote attacker could provide a specially-crafted TIFF image file, which once converted into the JPEG 2000 file format with an application linked against OpenJPEG (such as 'image_to_j2k'), would lead to that application crash, or, potentially arbitrary code execution with the privileges of the user running the application.