Public bug reported:
Ubuntu release: 10.04 LTS
Package: qjson
Version: 0.7.1-1
The following test case produces a segmentation fault on Ubuntu:
j.cpp:
#include <QDebug>
#include <QFile>
#include <QVariant>
#include <qjson/parser.h>
int main() {
QJson::Parser parser;
QFile f("test.json");
bool ok;
// Reading from a QByteArray works fine.
f.open(QIODevice::ReadOnly);
QByteArray data = f.readAll();
f.close();
QVariantMap result1 = parser.parse(data, &ok).toMap();
qDebug() << result1;
// Reading from a QIODevice * segfaults
f.open(QIODevice::ReadOnly);
QVariantMap result2 = parser.parse(&f, &ok).toMap();
f.close();
qDebug() << result2;
return 0;
}
Here's some test data and a qmake project file for the test case:
test.json:
{
"a": "b"
}
j.pro:
TEMPLATE = app
TARGET =
DEPENDPATH += .
INCLUDEPATH += .
SOURCES += j.cpp
LIBS += -lqjson
Running this code produces:
$ ./j
QMap(("a", QVariant(QString, "b") ) )
Segmentation fault
whereas it should produce the same line of output twice.
The gdb backtrace is:
Program received signal SIGSEGV, Segmentation fault.
0x00849886 in QIODevice::read(char*, long long) () from /usr/lib/libQtCore.so.4
(gdb) bt
#0 0x00849886 in QIODevice::read(char*, long long) ()
from /usr/lib/libQtCore.so.4
#1 0x0084a530 in QIODevice::getChar(char*) () from /usr/lib/libQtCore.so.4
#2 0x001360f2 in JSonScanner::yylex(QVariant*, yy::location*) ()
from /usr/lib/libqjson.so.0
#3 0x001389b3 in yy::yylex(QVariant*, yy::location*, QJson::ParserPrivate*) ()
from /usr/lib/libqjson.so.0
#4 0x0013ab91 in yy::json_parser::parse() () from /usr/lib/libqjson.so.0
#5 0x001352e6 in QJson::Parser::parse(QIODevice*, bool*) ()
from /usr/lib/libqjson.so.0
#6 0x0804c358 in main ()
(gdb)
The same test case works fine with the same version of QJson on Mac OS
X, so I am not sure this is a bug in QJson itself.
** Affects: qjson (Ubuntu)
Importance: Undecided
Status: New
--
Segmentation fault in QJson::Parser when reading from a QIODevice
https://bugs.launchpad.net/bugs/610656
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