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ipcns: fix use after free in free_ipc_ns()

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commit b515498 ("userns: add a user namespace owner of ipc ns") added a
user namespace owner of ipc ns, but it also introduced a use after free in
free_ipc_ns().

Signed-off-by: Xiaotian Feng <dfeng@redhat.com>
Acked-by: "Serge E. Hallyn" <serge.hallyn@canonical.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Xiaotian Feng 2011-03-25 01:57:01 -07:00 committed by Linus Torvalds
parent c03e3126e4
commit be4d250ab4
1 changed files with 1 additions and 1 deletions
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2
ipc/namespace.c
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@ -104,7 +104,6 @@ static void free_ipc_ns(struct ipc_namespace *ns)
sem_exit_ns(ns); sem_exit_ns(ns);
msg_exit_ns(ns); msg_exit_ns(ns);
shm_exit_ns(ns); shm_exit_ns(ns);
kfree(ns);
atomic_dec(&nr_ipc_ns); atomic_dec(&nr_ipc_ns);
/* /*
@ -113,6 +112,7 @@ static void free_ipc_ns(struct ipc_namespace *ns)
*/ */
ipcns_notify(IPCNS_REMOVED); ipcns_notify(IPCNS_REMOVED);
put_user_ns(ns->user_ns); put_user_ns(ns->user_ns);
kfree(ns);
} }
/* /*