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  1. Jun 15, 2013
    • Oleg Nesterov's avatar
      fput: task_work_add() can fail if the caller has passed exit_task_work() · e7b2c406
      Oleg Nesterov authored
      
      
      fput() assumes that it can't be called after exit_task_work() but
      this is not true, for example free_ipc_ns()->shm_destroy() can do
      this. In this case fput() silently leaks the file.
      
      Change it to fallback to delayed_fput_work if task_work_add() fails.
      The patch looks complicated but it is not, it changes the code from
      
      	if (PF_KTHREAD) {
      		schedule_work(...);
      		return;
      	}
      	task_work_add(...)
      
      to
      	if (!PF_KTHREAD) {
      		if (!task_work_add(...))
      			return;
      		/* fallback */
      	}
      	schedule_work(...);
      
      As for shm_destroy() in particular, we could make another fix but I
      think this change makes sense anyway. There could be another similar
      user, it is not safe to assume that task_work_add() can't fail.
      
      Reported-by: default avatarAndrey Vagin <avagin@openvz.org>
      Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      e7b2c406
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