[PATCH] fix do_wait() vs exec() race

When non-leader thread does exec, de_thread adds old leader to the init's
->children list in EXIT_ZOMBIE state and drops tasklist_lock.

This means that release_task(leader) in de_thread() is racy vs do_wait()
from init task.

I think de_thread() should set old leader's state to EXIT_DEAD instead.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: george anzinger <george@mvista.com>
Cc: Roland Dreier <rolandd@cisco.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/exec.c

@@ -668,7 +668,7 @@ static inline int de_thread(struct task_struct *tsk)
 	if (!thread_group_leader(current)) {
 		struct task_struct *parent;
 		struct dentry *proc_dentry1, *proc_dentry2;
-		unsigned long exit_state, ptrace;
+		unsigned long ptrace;
 
 		/*
 		 * Wait for the thread group leader to be a zombie.
@@ -726,15 +726,15 @@ static inline int de_thread(struct task_struct *tsk)
 		list_del(&current->tasks);
 		list_add_tail(&current->tasks, &init_task.tasks);
 		current->exit_signal = SIGCHLD;
-		exit_state = leader->exit_state;
+
+		BUG_ON(leader->exit_state != EXIT_ZOMBIE);
+		leader->exit_state = EXIT_DEAD;
 
 		write_unlock_irq(&tasklist_lock);
 		spin_unlock(&leader->proc_lock);
 		spin_unlock(&current->proc_lock);
 		proc_pid_flush(proc_dentry1);
 		proc_pid_flush(proc_dentry2);
-
-		BUG_ON(exit_state != EXIT_ZOMBIE);
         }
 
 	/*