Keyrings fixes

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Merge tag 'keys-fixes-20150107' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull keyrings fixes from David Howells:
 "Two fixes:

   - Fix for the order in which things are done during key garbage
     collection to prevent named keyrings causing a crash
     [CVE-2014-9529].

   - Fix assoc_array to explicitly #include rcupdate.h to prevent
     compilation errors under certain circumstances"

* tag 'keys-fixes-20150107' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  assoc_array: Include rcupdate.h for call_rcu() definition
  KEYS: close race between key lookup and freeing

lib/assoc_array.c

@@ -11,6 +11,7 @@
  * 2 of the Licence, or (at your option) any later version.
  */
 //#define DEBUG
+#include <linux/rcupdate.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/assoc_array_priv.h>

security/keys/gc.c

@@ -148,12 +148,12 @@ static noinline void key_gc_unused_keys(struct list_head *keys)
 		if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags))
 			atomic_dec(&key->user->nikeys);
 
-		key_user_put(key->user);
-
 		/* now throw away the key memory */
 		if (key->type->destroy)
 			key->type->destroy(key);
 
+		key_user_put(key->user);
+
 		kfree(key->description);
 
 #ifdef KEY_DEBUGGING