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-rw-r--r--Source/JavaScriptCore/runtime/JSArray.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/JSArray.cpp b/Source/JavaScriptCore/runtime/JSArray.cpp
index 609781c65..8398ae77d 100644
--- a/Source/JavaScriptCore/runtime/JSArray.cpp
+++ b/Source/JavaScriptCore/runtime/JSArray.cpp
@@ -499,6 +499,7 @@ bool JSArray::shiftCount(ExecState* exec, unsigned count)
ArrayStorage* storage = ensureArrayStorage(exec->globalData());
unsigned oldLength = storage->length();
+ ASSERT(count <= oldLength);
// If the array contains holes or is otherwise in an abnormal state,
// use the generic algorithm in ArrayPrototype.