Limit the nesting depth of the Json parser

The parser is recursive and too deeply nested json would
cause it to exhaust the available stack space leading to
crashes.

We now abort parsing with a DeepNesting parse error if the
document is too deeply nested. The current nesting limit
is set to 1024, which should be more then enough for any
real JSON data set.

Change-Id: I4adea3fd727149f7342536d73cf4530361a0a3a1
Reviewed-by: Jamey Hicks <jamey.hicks@nokia.com>
Reviewed-by: Denis Dzyubenko <denis.dzyubenko@nokia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/corelib/json/qjsondocument.h b/src/corelib/json/qjsondocument.h
index c67899192c..bdb171c3cb 100644
--- a/src/corelib/json/qjsondocument.h
+++ b/src/corelib/json/qjsondocument.h
@@ -68,7 +68,8 @@ struct Q_CORE_EXPORT QJsonParseError
         IllegalEscapeSequence,
         IllegalUTF8String,
         UnterminatedString,
-        MissingObject
+        MissingObject,
+        DeepNesting
     };
 
     QString    errorString() const;