ima: delay template descriptor lookup until use

process_measurement() always calls ima_template_desc_current(),
including when an IMA policy has not been defined.

This patch delays template descriptor lookup until action is
determined.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index cf1c369..f474c60 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -159,7 +159,7 @@
 {
 	struct inode *inode = file_inode(file);
 	struct integrity_iint_cache *iint;
-	struct ima_template_desc *template_desc = ima_template_desc_current();
+	struct ima_template_desc *template_desc;
 	char *pathbuf = NULL;
 	const char *pathname = NULL;
 	int rc = -ENOMEM, action, must_appraise, _func;
@@ -203,6 +203,7 @@
 		goto out_digsig;
 	}
 
+	template_desc = ima_template_desc_current();
 	if (strcmp(template_desc->name, IMA_TEMPLATE_IMA_NAME) == 0) {
 		if (action & IMA_APPRAISE_SUBMASK)
 			xattr_ptr = &xattr_value;