Details
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Bug
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Resolution: Done
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P3: Somewhat important
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5.12.2
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None
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b8a911fbebfcd297ce08b91fbe85bb1624d257d9 (qt/qtbase/5.13)
Description
QPainter::end() leaks memory, if the warning the "QPainter::end: Painter ended with %d saved states" occurs. That is, memory is leaked, if for example save() is called without calling restore() before end of painting.
The attached example code qpainter_mem_leak.cpp
reproduces the problem which was also verified with valgrind:
valgrind --tool=memcheck --leak-check=full --track-origins=yes qpainter_mem_leak:
| ==24569== 2,680 (2,048 direct, 632 indirect) bytes in 2 blocks are definitely lost in loss record 3,880 of 3,913 |
| ==24569== at 0x4C28203: operator new(unsigned long) (vg_replace_malloc.c:334) |
| ==24569== by 0x9389CD9: QRasterPaintEngine::createState(QPainterState*) const (in [...]/lib/libQt5Gui.so.5.12.2) |
| ==24569== by 0x93A6244: QPainter::begin(QPaintDevice*) (in [...]/lib/libQt5Gui.so.5.12.2) |
Attachments
| For Gerrit Dashboard: QTBUG-77843 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 273608,4 | QPainter: Avoid leaking memory on unbalanced save/restore | 5.13 | qt/qtbase | Status: MERGED | +2 | 0 |