CRED: Fix memory leak in error handling

Fix a memory leak on an OOM condition in prepare_usermodehelper_creds().

Signed-off-by: Mathieu Desnoyers <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
Signed-off-by: James Morris <[e-mail]>

kernel/cred.c

···
 
 	new = kmem_cache_alloc(cred_jar, GFP_ATOMIC);
 	if (!new)
-		return NULL;
+		goto free_tgcred;
 
 	kdebug("prepare_usermodehelper_creds() alloc %p", new);
 
···
 
 error:
 	put_cred(new);
+free_tgcred:
+#ifdef CONFIG_KEYS
+	kfree(tgcred);
+#endif
 	return NULL;
 }