From 8e8a92ca2dd9d4be53517bbfbb8215bdbd0c9ff2 Mon Sep 17 00:00:00 2001
From: Cloud Wu <cloudwu@gmail.com>
Date: Wed, 3 Apr 2019 11:15:33 +0800
Subject: [PATCH] overflow check

---
 3rd/lua/lstring.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/3rd/lua/lstring.c b/3rd/lua/lstring.c
index b0593436..7e3f95a6 100644
--- a/3rd/lua/lstring.c
+++ b/3rd/lua/lstring.c
@@ -367,11 +367,12 @@ shrstr_expandpage(int cap) {
 		return;
 	int osz = s->mask + 1;
 	int sz = osz * 2;
-	// overflow check
-	if (sz <= 0)
-		return;
-	while (sz < cap)
+	while (sz < cap) {
+		// overflow check
+		if (sz <= 0)
+			return;
 		sz = sz * 2;
+	}
 	struct shrmap_slot * newpage = shrstr_newpage(sz);
 	rwlock_wlock(&s->lock);
 	int succ = shrstr_allocpage(s, osz, sz, newpage);