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binder: use group leader instead of open thread

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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@google.com>
Cc: stable <stable@vger.kernel.org> # 4.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos 2017-06-29 12:01:36 -07:00 committed by Greg Kroah-Hartman
parent a2b18708ee
commit c4ea41ba19
1 changed files with 2 additions and 2 deletions
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4
drivers/android/binder.c
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@ -3460,8 +3460,8 @@ static int binder_open(struct inode *nodp, struct file *filp)
proc = kzalloc(sizeof(*proc), GFP_KERNEL); proc = kzalloc(sizeof(*proc), GFP_KERNEL);
if (proc == NULL) if (proc == NULL)
return -ENOMEM; return -ENOMEM;
get_task_struct(current); get_task_struct(current->group_leader);
proc->tsk = current; proc->tsk = current->group_leader;
INIT_LIST_HEAD(&proc->todo); INIT_LIST_HEAD(&proc->todo);
init_waitqueue_head(&proc->wait); init_waitqueue_head(&proc->wait);
proc->default_priority = task_nice(current); proc->default_priority = task_nice(current);