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Do some bounds checking on iOrder.
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@ -930,6 +930,10 @@ HEADER_InsertItemA (HWND hwnd, WPARAM wParam, LPARAM lParam)
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nItem = infoPtr->uNumItem;
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iOrder = (phdi->mask & HDI_ORDER) ? phdi->iOrder : nItem;
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if (iOrder < 0)
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iOrder = 0;
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else if (infoPtr->uNumItem < iOrder)
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iOrder = infoPtr->uNumItem;
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if (infoPtr->uNumItem == 0) {
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infoPtr->items = Alloc (sizeof (HEADER_ITEM));
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