ima: Evaluate error in init_ima()

Evaluate error in init_ima() before register_blocking_lsm_notifier() and
return if not zero.

Cc: [email protected] # 5.3.x
Fixes: b169424 ("ima: use the lsm policy update notifier")
Signed-off-by: Roberto Sassu <[email protected]>
Reviewed-by: James Morris <[email protected]>
Signed-off-by: Mimi Zohar <[email protected]>

Author: robertosassu

security/integrity/ima/ima_main.c

@@ -792,6 +792,9 @@ static int __init init_ima(void)
 		error = ima_init();
 	}
 
+	if (error)
+		return error;
+
 	error = register_blocking_lsm_notifier(&ima_lsm_policy_notifier);
 	if (error)
 		pr_warn("Couldn't register LSM notifier, error %d\n", error);