Bug 65790 – [QT] Possible Leaks WKRetainPtr<> should Adopt allocated Copy

• Component: WebKit Qt
• Status: RESOLVED FIXED

[Joseph Pecoraro]

shell> cd Source/
shell> a 'Retain.*?=.*?Copy'

    WebKit2/UIProcess/API/qt/qweberror.cpp
    61:    WKRetainPtr<WKStringRef> errorDomainPtr = adoptWK(WKErrorCopyDomain(d->error.get()));
    80:    WKRetainPtr<WKURLRef> failingURL = adoptWK(WKErrorCopyFailingURL(d->error.get()));
    
    WebKit2/UIProcess/qt/qwkhistory.cpp
    76:    WKRetainPtr<WKStringRef> title = WKBackForwardListItemCopyTitle(d->m_backForwardListItem.get());
    84:    WKRetainPtr<WKURLRef> url = WKBackForwardListItemCopyURL(d->m_backForwardListItem.get());

These look like possible leaks. Since WKRetainPtr::operator= does a WKRetain and typically a WK*Copy*()
will return a +1 allocation. I think the correct behavior here would be AdoptWK like:

    WebKit2/UIProcess/qt/qwkpreferences.cpp
    93:        WKRetainPtr<WKStringRef> stringRef(AdoptWK, WKPreferencesCopyStandardFontFamily(d->ref));

[Joseph Pecoraro]

I should clarify.

>     WebKit2/UIProcess/API/qt/qweberror.cpp
>     61:    WKRetainPtr<WKStringRef> errorDomainPtr = adoptWK(WKErrorCopyDomain(d->error.get()));
>     80:    WKRetainPtr<WKURLRef> failingURL = adoptWK(WKErrorCopyFailingURL(d->error.get()));

These look good because of the adoptWK(...).

>     WebKit2/UIProcess/qt/qwkhistory.cpp
>     76:    WKRetainPtr<WKStringRef> title = WKBackForwardListItemCopyTitle(d->m_backForwardListItem.get());
>     84:    WKRetainPtr<WKURLRef> url = WKBackForwardListItemCopyURL(d->m_backForwardListItem.get());

These however don't look so good.

[Joseph Pecoraro]

Created attachment 103114 [details]
[PATCH] Untested Proposed Fix

I haven't tested this patch so I really suggest a WebKit2 / Qt developer take a look at this.
I did not do a Qt build to test this, I just inspected the source.

[WebKit Review Bot]

Comment on attachment 103114 [details]
[PATCH] Untested Proposed Fix

Clearing flags on attachment: 103114

Committed r92574: <http://trac.webkit.org/changeset/92574>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.