Bug 81977 – WebKitWebView signals with GError parameters cause crashes when using GObject Introspection

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Gary Kramlich]

If you connect to the WebKetWebView::load-error or WebKitWebView::resource-load-error signals when using WebKit-3.0.typelib your program will crash upon signal emission for those 2 signals with the following error:

CRITICAL **: Converting of type 'void' is not implemented

This is because the closures for both signals call out the GError parameter as a pointer when it should be specified as a GBoxed type.  For reference, GError was made a boxed type in Gtk 2.26.

There should be no issues with existing C/C++ code since the pointer that is passed from the signal is type casted back into a GError in the callback function.

I will be uploading a patch shortly which resolves the issue by adding 2 closures and changing the type's passed to g_signal_new.

I have verified the changes manually but I can provide example code if needed.

[Gary Kramlich]

Created attachment 133364 [details]
Patch

[Martin Robinson]

We still support versions of GTK+ older than 2.26, so I do not think we can merge this change as-is. Perhaps we could make the defintion of these signals a compile-time decision.

[Martin Robinson]

Comment on attachment 133364 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=133364&action=review

> Source/WebKit/gtk/ChangeLog:5
> +        Added marshallers for BOOLEAN:OBJECT,STRING,BOXED and VOID:OBJECT,OBJECT,BOXED and changed the signal signatures for WebKitWebView::load-fail and WebKitWebView::resource-load-failed to use the new marshallers since GError has been a GBoxed type since Gtk 2.26.  This fixes these signals for the gobject-introspection bindings.
> +        https://bugs.webkit.org/show_bug.cgi?id=81977
> +

I really appreciate you including a ChangeLog for this change. In the future, it's better to generate the ChangeLog with Tools/Scripts/prepare-ChangeLogs and to put the long-form description below the "Revied by..." line.

[Martin Robinson]

Comment on attachment 133364 [details]
Patch

Of course, the GLib version is the one that matters here, so this patch is fine. :)

[Gary Kramlich]

Yeah sorry about the confusion, clearly I *meant* glib :)

Also I used "webkit-patch upload" as mentioned at http://www.webkit.org/coding/contributing.html.  I'll use the other one in the future!  Thanks.

[Martin Robinson]

Committed r112111: <http://trac.webkit.org/changeset/112111>