diff --git a/qtfs/qtfs_server/fsops.c b/qtfs/qtfs_server/fsops.c
index c1705d64524f326c3a33ce83feb3ab27f9753b46..32624e83c08d98139c9fa33bcdf761e88c0fce83 100644
--- a/qtfs/qtfs_server/fsops.c
+++ b/qtfs/qtfs_server/fsops.c
@@ -49,7 +49,9 @@ bool in_white_list(char *path, int type)
 {
 	int i, in_wl = -1;
 
+    read_lock(&g_whitelist_lock);
 	if (!g_whitelist[type]) {
+        read_unlock(&g_whitelist_lock);
 		return true;
 	}
 	for (i = 0; i < g_whitelist[type]->len; i++) {
@@ -58,6 +60,7 @@ bool in_white_list(char *path, int type)
 			break;
 		}
 	}
+    read_unlock(&g_whitelist_lock);
 	return in_wl != -1;
 }