From c842af1bd5e80b40ea83edb040c864aba8c299c6 Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Wed, 13 Dec 2023 18:59:47 +0100
Subject: raise an error if a private method is added twice to an object

---
 lib/quickjs/quickjs.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib/quickjs/quickjs.c')

diff --git a/lib/quickjs/quickjs.c b/lib/quickjs/quickjs.c
index 2dbc4914..c68a8ab3 100644
--- a/lib/quickjs/quickjs.c
+++ b/lib/quickjs/quickjs.c
@@ -7456,6 +7456,12 @@ static int JS_AddBrand(JSContext *ctx, JSValueConst obj, JSValueConst home_obj)
         return -1;
     }
     p1 = JS_VALUE_GET_OBJ(obj);
+    prs = find_own_property(&pr, p1, brand_atom);
+    if (unlikely(prs)) {
+        JS_FreeAtom(ctx, brand_atom);
+        JS_ThrowTypeError(ctx, "private method is already present");
+        return -1;
+    }
     pr = add_property(ctx, p1, brand_atom, JS_PROP_C_W_E);
     JS_FreeAtom(ctx, brand_atom);
     if (!pr)
-- 
cgit 1.4.1-2-gfad0