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fs/file_table.c:fput(): add comment

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A missed update to "fput: task_work_add() can fail if the caller has
passed exit_task_work()".

Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrey Vagin <avagin@openvz.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andrew Morton 2013-07-08 14:24:15 -07:00 committed by Al Viro
parent bb458c644a
commit 64372501e2
1 changed files with 6 additions and 0 deletions
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6
fs/file_table.c
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@ -313,6 +313,12 @@ void fput(struct file *file)
init_task_work(&file->f_u.fu_rcuhead, ____fput);
if (!task_work_add(task, &file->f_u.fu_rcuhead, true))
return;
/*
* After this task has run exit_task_work(),
* task_work_add() will fail. free_ipc_ns()->
* shm_destroy() can do this. Fall through to delayed
* fput to avoid leaking *file.
*/
}
spin_lock_irqsave(&delayed_fput_lock, flags);
list_add(&file->f_u.fu_list, &delayed_fput_list);