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Type: Bug
Resolution: Out of scope
Priority: P4: Low
Fix Version/s: None
Affects Version/s: 5.13.0, 5.13.2, 5.15.16, 6.2.10, 6.5.3, 6.6.0
Component/s: Core: Resource System
Labels:
- Reported_by_support_standard
Environment:
Windows 11, Windows 10 22H2

Commits:
e696bec76 (dev), 60d60dba7 (6.7), 06618fbeb (6.6), b7792d9b8 (tqtc/lts-6.5)
Sprint:
Foundations Sprint 97, Foundations Sprint 98, Foundations Sprint 99, Foundation Sprint 100, Foundation Sprint 101, Foundations Sprint 102, Foundation Sprint 103, Foundation Sprint 104, Foundation Sprint 105, Foundation Sprint 106, Foundation Sprint 107

Summary

// From resourcecrash.zip
int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    QString srcPath = ":/bad-file.rcc";
    QString destPath = "bad-file-on-disk.rcc";
    QString otherPath = ":/good-file.txt";

    qDebug().noquote() << QString("Copying '%1' to '%2'").arg(srcPath, destPath);
    QFile::copy(srcPath, destPath);

    QFileInfo info(destPath);
    qDebug().noquote() << destPath << "exists?:" << info.exists() << QString("(%1 bytes)").arg(info.size());

    bool registered = QResource::registerResource(destPath);
    qDebug().noquote() << destPath << "registered?:" << registered;

    QFile otherFile(otherPath);
    qDebug() << "Opening" << otherPath;
    if (otherFile.open(QIODevice::ReadOnly))
        qDebug() << "Read data:" << otherFile.readAll();
    else
        qDebug() << "Failed to open file";
}

Using Qt 5.12.12, the application does not register the bad file and everything runs fine:

Copying ':/bad-file.rcc' to 'bad-file-on-disk.rcc'
bad-file-on-disk.rcc exists?: true (55876 bytes)
bad-file-on-disk.rcc registered?: false
Opening ":/good-file.txt"
Read data: "Hello world!"

Using Qt 5.15.16 or 6.x, the application registers the bad file. Subsequent attempts to access the resource system will crash:

Copying ':/bad-file.rcc' to 'bad-file-on-disk.rcc'
bad-file-on-disk.rcc exists?: true (55876 bytes)
bad-file-on-disk.rcc registered?: true
Opening ":/good-file.txt"
### CRASHES HERE

Original report (title: "QResourceRoot::hash crash")
A customer sent me a dmp: my application crashes when trying to load a js file. From the stack, it looks like there is an if that does not work properly.

I'm not really sure and unfortunately I cannot provide the file causing this issue. But I think that the if at line 735 (and 744) should be as follow: