Fix crash when changing from a simple to a sparse array

After that change, if we ran out of slots in the freeList,
the last entry would point to the first Value in the value
array, not indicating that we ran out of free slots.

Task-number: QTBUG-65828
Change-Id: I3e57bb7a0c2dc29172a485a6ea957b6ab5ac962e

1 files changed, 1 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4sparsearray.cpp b/src/qml/jsruntime/qv4sparsearray.cpp
index b7be66bc31..f295e74adc 100644
--- a/src/qml/jsruntime/qv4sparsearray.cpp
+++ b/src/qml/jsruntime/qv4sparsearray.cpp
@@ -395,6 +395,7 @@ void SparseArray::freeTree(SparseArrayNode *root, int alignment)
 SparseArray::SparseArray()
     : numEntries(0)
 {
+    freeList = Primitive::emptyValue(UINT_MAX).asReturnedValue();
     header.p = 0;
     header.left = 0;
     header.right = 0;