Debugger: Put some restrictions on byte array dumper

This makes 100M a hard limit, reducing the likelihood that an
uninitialized byte array will look valid.

Change-Id: I51dc5f39e0c7327faa8c1d0640934a6074d8c559
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

share/qtcreator/debugger/qttypes.py

@@ -58,6 +58,7 @@ def qform__QByteArray():
 
 def qdump__QByteArray(d, value):
     data, size, alloc = d.byteArrayData(value)
+    d.check(0 <= size and size <= alloc and alloc <= 1000 * 1000 * 100)
     d.putNumChild(size)
     elided, p = d.encodeByteArrayHelper(d.extractPointer(value), d.displayStringLimit)
     displayFormat = d.currentItemFormat()
@@ -78,6 +79,7 @@ def qdump__QByteArray(d, value):
 
 def qdump__QByteArrayData(d, value):
     data, size, alloc = d.byteArrayDataHelper(d.addressOf(value))
+    d.check(0 <= size and size <= alloc and alloc <= 1000 * 1000 * 100)
     d.putValue(d.readMemory(data, size), Hex2EncodedLatin1)
     d.putNumChild(1)
     if d.isExpanded():