Bug 49342 – [Qt] QWebScriptWorld::world() may crash

• Component: WebKit Qt
• Status: RESOLVED FIXED

[Yi Shen]

It might be trivial but we'd better check the value of the private data in the QWebScriptWorld::world() to prevent the possible crash -- 'd' may have an empty data if USE(JSC) is undefined for some platform.

QWebScriptWorld::QWebScriptWorld()
{
#if USE(JSC) // d can have an empty data if this macro fails
    d = new QWebScriptWorldPrivate(ScriptController::createWorld());    
#endif
}

[Yi Shen]

Created attachment 73536 [details]
first try

[Kenneth Rohde Christiansen]

Comment on attachment 73536 [details]
first try

View in context: https://bugs.webkit.org/attachment.cgi?id=73536&action=review

> WebKit/qt/Api/qwebscriptworld.cpp:53
> +    return d.data() ? d->world.get() : NULL;

huh? how does world depend on data() ? Also we do not use NULL in C++ code.

[Yi Shen]

Created attachment 73593 [details]
second try

[Yi Shen]

(In reply to comment #2)
> (From update of attachment 73536 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=73536&action=review
> 
> > WebKit/qt/Api/qwebscriptworld.cpp:53
> > +    return d.data() ? d->world.get() : NULL;
> 
> huh? how does world depend on data() ? Also we do not use NULL in C++ code.

Thanks, you are right. I updated my patch, which returns 0 when the internal pointer to the shared data object is not null.

[Andreas Kling]

Comment on attachment 73593 [details]
second try

This is a purely artificial problem since we always build with USE(JSC) and the V8 port will most likely require large changes to QWebScriptWorld anyway.
That said, I don't see any harm in adding this check. r=me

[WebKit Commit Bot]

Comment on attachment 73593 [details]
second try

Clearing flags on attachment: 73593

Committed r71818: <http://trac.webkit.org/changeset/71818>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.