This is a note to let you know that I've just added the patch titled
pid_namespace: pidns_get() should check task_active_pid_ns() != NULL
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pid_namespace-pidns_get-should-check-task_active_pid_ns-null.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d23082257d83e4bc89727d5aedee197e907999d2 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Wed, 2 Apr 2014 17:45:05 +0200
Subject: pid_namespace: pidns_get() should check task_active_pid_ns() != NULL
From: Oleg Nesterov <oleg@xxxxxxxxxx>
commit d23082257d83e4bc89727d5aedee197e907999d2 upstream.
pidns_get()->get_pid_ns() can hit ns == NULL. This task_struct can't
go away, but task_active_pid_ns(task) is NULL if release_task(task)
was already called. Alternatively we could change get_pid_ns(ns) to
check ns != NULL, but it seems that other callers are fine.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Eric W. Biederman ebiederm@xxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/pid_namespace.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -318,7 +318,9 @@ static void *pidns_get(struct task_struc
struct pid_namespace *ns;
rcu_read_lock();
- ns = get_pid_ns(task_active_pid_ns(task));
+ ns = task_active_pid_ns(task);
+ if (ns)
+ get_pid_ns(ns);
rcu_read_unlock();
return ns;
Patches currently in stable-queue which might be from oleg@xxxxxxxxxx are
queue-3.13/pid_namespace-pidns_get-should-check-task_active_pid_ns-null.patch
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