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| author | Andrew Morton <akpm@linux-foundation.org> | 2013-07-08 14:24:15 -0700 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-07-13 13:27:42 +0400 |
| commit | 64372501e2af9b11e2ffd1ff79345dc4b1abe539 (patch) | |
| tree | c3a26f2e5320a5def0838adbac4cca4de5e2b29b | |
| parent | bb458c644a59dbba3a1fe59b27106c5e68e1c4bd (diff) | |
| download | linux-64372501e2af9b11e2ffd1ff79345dc4b1abe539.tar.bz2 | |
fs/file_table.c:fput(): add comment
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>
| -rw-r--r-- | fs/file_table.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/file_table.c b/fs/file_table.c index 08e719b884ca..b9a77ad08b4d 100644 --- a/fs/file_table.c +++ b/fs/file_table.c @@ -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); |