3 files changed, 33 insertions, 24 deletions

diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c
index b77eb5304788..c1fe0fcee8e3 100644
--- a/crypto/asymmetric_keys/asymmetric_type.c
+++ b/crypto/asymmetric_keys/asymmetric_type.c
@@ -164,29 +164,6 @@ static void asymmetric_key_free_preparse(struct key_preparsed_payload *prep)
 }
 
 /*
- * Instantiate a asymmetric_key defined key.  The key was preparsed, so we just
- * have to transfer the data here.
- */
-static int asymmetric_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
-{
-        int ret;
-
-        pr_devel("==>%s()\n", __func__);
-
-        ret = key_payload_reserve(key, prep->quotalen);
-        if (ret == 0) {
-                key->type_data.p[0] = prep->type_data[0];
-                key->type_data.p[1] = prep->type_data[1];
-                key->payload.data = prep->payload;
-                prep->type_data[0] = NULL;
-                prep->type_data[1] = NULL;
-                prep->payload = NULL;
-        }
-        pr_devel("<==%s() = %d\n", __func__, ret);
-        return ret;
-}
-
-/*
  * dispose of the data dangling from the corpse of a asymmetric key
  */
 static void asymmetric_key_destroy(struct key *key)
@@ -205,7 +182,7 @@ struct key_type key_type_asymmetric = {
         .name           = "asymmetric",
         .preparse       = asymmetric_key_preparse,
         .free_preparse  = asymmetric_key_free_preparse,
-        .instantiate    = asymmetric_key_instantiate,
+        .instantiate    = generic_key_instantiate,
         .match          = asymmetric_key_match,
         .destroy        = asymmetric_key_destroy,
         .describe       = asymmetric_key_describe,
diff --git a/include/linux/key-type.h b/include/linux/key-type.h
index a74c3a84dfdd..88503dca2a57 100644
--- a/include/linux/key-type.h
+++ b/include/linux/key-type.h
@@ -159,5 +159,7 @@ static inline int key_negate_and_link(struct key *key,
         return key_reject_and_link(key, timeout, ENOKEY, keyring, instkey);
 }
 
+extern int generic_key_instantiate(struct key *key, struct key_preparsed_payload *prep);
+
 #endif /* CONFIG_KEYS */
 #endif /* _LINUX_KEY_TYPE_H */
diff --git a/security/keys/key.c b/security/keys/key.c
index 2048a110e7f1..7c9acbf106b6 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -1024,6 +1024,36 @@ void key_invalidate(struct key *key)
 EXPORT_SYMBOL(key_invalidate);
 
 /**
+ * generic_key_instantiate - Simple instantiation of a key from preparsed data
+ * @key: The key to be instantiated
+ * @prep: The preparsed data to load.
+ *
+ * Instantiate a key from preparsed data.  We assume we can just copy the data
+ * in directly and clear the old pointers.
+ *
+ * This can be pointed to directly by the key type instantiate op pointer.
+ */
+int generic_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
+{
+        int ret;
+
+        pr_devel("==>%s()\n", __func__);
+
+        ret = key_payload_reserve(key, prep->quotalen);
+        if (ret == 0) {
+                key->type_data.p[0] = prep->type_data[0];
+                key->type_data.p[1] = prep->type_data[1];
+                rcu_assign_keypointer(key, prep->payload);
+                prep->type_data[0] = NULL;
+                prep->type_data[1] = NULL;
+                prep->payload = NULL;
+        }
+        pr_devel("<==%s() = %d\n", __func__, ret);
+        return ret;
+}
+EXPORT_SYMBOL(generic_key_instantiate);
+
+/**
  * register_key_type - Register a type of key.
  * @ktype: The new key type.
  *