From b5b4c7fed589aef04f6b5add5f0f0d9c2f1fd2f5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?jackerli=28=E6=9D=8E=E5=89=91=29?= <jackerli@tencent.com>
Date: Wed, 28 Sep 2022 16:41:59 +0800
Subject: [PATCH] fix: arc4_getword integer overflow, detected by
 -fsanitize=undefined

---
 arc4random.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arc4random.c b/arc4random.c
index b5f66b4c6f..c9533b1741 100644
--- a/arc4random.c
+++ b/arc4random.c
@@ -418,7 +418,7 @@ arc4_getword(void)
 {
 	unsigned int val;
 
-	val = arc4_getbyte() << 24;
+	val = (unsigned)arc4_getbyte() << 24;
 	val |= arc4_getbyte() << 16;
 	val |= arc4_getbyte() << 8;
 	val |= arc4_getbyte();