This is a note to let you know that I've just added the patch titled binder: use group leader instead of open thread to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: binder-use-group-leader-instead-of-open-thread.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c4ea41ba195d01c9af66fb28711a16cc97caa9c5 Mon Sep 17 00:00:00 2001 From: Todd Kjos <tkjos@xxxxxxxxxxx> Date: Thu, 29 Jun 2017 12:01:36 -0700 Subject: binder: use group leader instead of open thread From: Todd Kjos <tkjos@xxxxxxxxxxx> commit c4ea41ba195d01c9af66fb28711a16cc97caa9c5 upstream. The binder allocator assumes that the thread that called binder_open will never die for the lifetime of that proc. That thread is normally the group_leader, however it may not be. Use the group_leader instead of current. Signed-off-by: Todd Kjos <tkjos@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/android/binder.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2966,8 +2966,8 @@ static int binder_open(struct inode *nod proc = kzalloc(sizeof(*proc), GFP_KERNEL); if (proc == NULL) return -ENOMEM; - get_task_struct(current); - proc->tsk = current; + get_task_struct(current->group_leader); + proc->tsk = current->group_leader; INIT_LIST_HEAD(&proc->todo); init_waitqueue_head(&proc->wait); proc->default_priority = task_nice(current); Patches currently in stable-queue which might be from tkjos@xxxxxxxxxxx are queue-4.4/binder-use-group-leader-instead-of-open-thread.patch