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  1. Qt
  2. QTBUG-116866

QRegularExpression leads Vlagrind report "Invalid read" issue

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Details

    • Bug
    • Resolution: Cannot Reproduce
    • Not Evaluated
    • None
    • 5.15.9
    • Core: QString and Unicode
    • None
    • Linux/X11

    Description

      Hi, Expert

      when we run the test code

          QRegularExpression escapedSlash("(\\\\)(/)");
    QString str = "MMWSPY";
    str.replace(escapedSlash, "/");

      with Qt 5.15.9, it report Valgrind "Invalid Read" issue

      ==122918== Invalid read of size 16
==122918==    at 0x1976FBC0: ???
==122918==    by 0x1587D367: ???
==122918==  Address 0x1587d36e is 30 bytes inside a block of size 40 alloc'd
==122918==    at 0x402E7AD: malloc (vg_replace_malloc.c:380)
==122918==    by 0x58B9B00: QArrayData::allocate(unsigned long, unsigned long, unsigned long, QFlags<QArrayData::AllocationOption>)
==122918==    by 0x594A992: QString::QString(int, Qt::Initialization) 
==122918==    by 0x5AF2D07: ???
==122918==    by 0x5AF35B1: ???
==122918==    by 0x594DFCA: QString::fromAscii_helper(char const*, int)

      Could you please help to fix it?

      if not, is it safe or how can we prevent this warning?

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            thiago Thiago Macieira
            jian_chen Jian Chen
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              Resolved:

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