[PATCH 4.4 47/68] block: fix use-after-free in sys_ioprio_get()

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Omar Sandoval commit 8ba8682107ee2ca3347354e018865d8e1967c5f4 upstream. get_task_ioprio() accesses the task->io_context without holding the task lock and thus can race with

[PATCH 4.4 47/68] block: fix use-after-free in sys_ioprio_get()

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Omar Sandoval commit 8ba8682107ee2ca3347354e018865d8e1967c5f4 upstream. get_task_ioprio() accesses the task->io_context without holding the task lock and thus can race with exit_io_context(),