CVE-2015-7891: Concurrent Execution using Shared Resource with Improper Synchronization

Race condition in the ioctl implementation in the Samsung Graphics 2D driver aka /dev/fimg2d in Samsung devices with Android L5.0/5.1 allows local users to trigger memory errors by leveraging definition of g2dlock and g2dunlock lock macros as no-ops, aka SVE-2015-4598...