From a8d25a2ed6e6306fb073578158572b04749f7891 Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Thu, 25 Jan 2018 22:15:26 +0100
Subject: WASM: Separate out ToTableIndex()

---
 js/src/wasm/WasmJS.cpp | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'js/src')

diff --git a/js/src/wasm/WasmJS.cpp b/js/src/wasm/WasmJS.cpp
index 07d6331b8b..0b030c8449 100644
--- a/js/src/wasm/WasmJS.cpp
+++ b/js/src/wasm/WasmJS.cpp
@@ -1484,6 +1484,20 @@ const JSPropertySpec WasmTableObject::properties[] =
     JS_PS_END
 };
 
+static bool
+ToTableIndex(JSContext* cx, HandleValue v, const Table& table, const char* noun, uint32_t* index)
+{
+    if (!ToNonWrappingUint32(cx, v, UINT32_MAX, "Table", noun, index))
+        return false;
+
+    if (*index >= table.length()) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_WASM_BAD_UINT32, "Table", noun);
+        return false;
+    }
+
+    return true;
+}
+
 /* static */ bool
 WasmTableObject::getImpl(JSContext* cx, const CallArgs& args)
 {
@@ -1491,7 +1505,7 @@ WasmTableObject::getImpl(JSContext* cx, const CallArgs& args)
     const Table& table = tableObj->table();
 
     uint32_t index;
-    if (!ToNonWrappingUint32(cx, args.get(0), table.length() - 1, "Table", "get index", &index))
+    if (!ToTableIndex(cx, args.get(0), table, "get index", &index))
         return false;
 
     ExternalTableElem& elem = table.externalArray()[index];
@@ -1530,7 +1544,7 @@ WasmTableObject::setImpl(JSContext* cx, const CallArgs& args)
         return false;
 
     uint32_t index;
-    if (!ToNonWrappingUint32(cx, args.get(0), table.length() - 1, "Table", "set index", &index))
+    if (!ToTableIndex(cx, args.get(0), table, "set index", &index))
         return false;
 
     RootedFunction value(cx);
-- 
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