From 083b7bab01e8c57ca50927fdf9d3d4d8d45068a4 Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Mon, 7 Apr 2025 12:02:01 +0200
Subject: [PATCH] Fix UB in BigInt left shift (saghul)

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

diff --git a/quickjs.c b/quickjs.c
index ae827ed..702ea8f 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -13857,7 +13857,7 @@ static no_inline __exception int js_binary_logic_slow(JSContext *ctx,
                 goto bigint_sar;
             }
         bigint_shl:
-            vd = (js_sdlimb_t)v1 << v2;
+            vd = (js_dlimb_t)v1 << v2;
             if (likely(vd >= JS_SHORT_BIG_INT_MIN &&
                        vd <= JS_SHORT_BIG_INT_MAX)) {
                 v = vd;