exit: reparent: fix the dead-parent PR_SET_CHILD_SUBREAPER reparenting

The ->has_child_subreaper code in find_new_reaper() finds alive "thread"
but returns another "reaper" thread which can be dead.

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Aaron Tomlin <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Kay Sievers <[email protected]>
Cc: Lennart Poettering <[email protected]>
Cc: Sterling Alexander <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 9a65f10dc9ff..fd38a8f04367 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -512,7 +512,7 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
 			thread = reaper;
 			do {
 				if (!(thread->flags & PF_EXITING))
-					return reaper;
+					return thread;
 			} while_each_thread(reaper, thread);
 		}
 	}