From: Hillf Danton <dhillf@gmail.com>
Date: Wed, 29 Dec 2010 13:55:28 +0000 (+0800)
Subject: fix freeing user_struct in user cache
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4ef9e11d6867f88951e30db910fa015300e31871;p=linux-beck.git

fix freeing user_struct in user cache

When racing on adding into user cache, the new allocated from mm slab
is freed without putting user namespace.

Since the user namespace is already operated by getting, putting has
to be issued.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/user.c b/kernel/user.c
index 2c7d8d5914b1..5c598ca781df 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -158,6 +158,7 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
 		spin_lock_irq(&uidhash_lock);
 		up = uid_hash_find(uid, hashent);
 		if (up) {
+			put_user_ns(ns);
 			key_put(new->uid_keyring);
 			key_put(new->session_keyring);
 			kmem_cache_free(uid_cachep, new);