Ensure we exactly match cfgstring prefix against 'tcm-user'

Author: Alex Reid

libtcmu.c

@@ -428,6 +428,7 @@ static bool device_parse_cfg(struct tcmu_device *dev,
 			     const char *dev_name, const char *cfgstring)
 {
 	int len;
+	int cfgstrlen;
 	const char *ptr, *oldptr;
 
 	len = snprintf(dev->dev_name, sizeof(dev->dev_name), "%s", dev_name);
@@ -439,9 +440,10 @@ static bool device_parse_cfg(struct tcmu_device *dev,
 	/* Check valid cfgstring */
 	oldptr = cfgstring;
 	ptr = strchr(oldptr, '/');
+	cfgstrlen = ptr-oldptr;
 	if (!ptr)
 		goto err_badcfg;
-	if (strncmp(cfgstring, "tcm-user", ptr-oldptr))
+	if (strncmp(cfgstring, "tcm-user", cfgstrlen) || cfgstring[cfgstrlen] != '/')
 		goto err_badcfg;
 
 	/* Get HBA name */