Bug 108636 – Creating a WebInspector.ContextMenu without an event crashes WebCore when calling .show()

• Component: Web Inspector (Deprecated)
• Status: RESOLVED FIXED

[Antoine Quint]

Creating a WebInspector.ContextMenu without an event crashes WebCore when calling .show()

[Antoine Quint]

Created attachment 186044 [details]
Patch

[Dean Jackson]

Comment on attachment 186044 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=186044&action=review

> Source/WebCore/ChangeLog:10
> +        No new tests (OOPS!).

At least mention why there are no tests, or remove this line.

[Radar WebKit Bug Importer]

<rdar://problem/13133613>

[Pavel Feldman]

Comment on attachment 186044 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=186044&action=review

> Source/WebCore/page/ContextMenuController.cpp:145
> +    if (!event || !event->isMouseEvent())

Do you want to add an assertion here instead?

[Antoine Quint]

(In reply to comment #4)
> (From update of attachment 186044 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=186044&action=review
> 
> > Source/WebCore/page/ContextMenuController.cpp:145
> > +    if (!event || !event->isMouseEvent())
> 
> Do you want to add an assertion here instead?

You mean *also* an assert before the early return?

[Pavel Feldman]

Comment on attachment 186044 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=186044&action=review

>>> Source/WebCore/page/ContextMenuController.cpp:145
>>> +    if (!event || !event->isMouseEvent())
>> 
>> Do you want to add an assertion here instead?
> 
> You mean *also* an assert before the early return?

I meant assertion + a check on the call site. One obviously needs an event for creating this menu.

[Antoine Quint]

Created attachment 186066 [details]
Patch

[Pavel Feldman]

Comment on attachment 186066 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=186066&action=review

> Source/WebCore/page/ContextMenuController.cpp:111
> +    if (!event)

When does this happen?

> Source/WebCore/page/ContextMenuController.cpp:130
> +    if (!event)

When does this happen?

[Antoine Quint]

(In reply to comment #8)
> (From update of attachment 186066 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=186066&action=review
> 
> > Source/WebCore/page/ContextMenuController.cpp:111
> > +    if (!event)
> 
> When does this happen?

I'm not sure when it would, but I understood from your previous comment you wanted all call sites to ContextMenuController::createContextMenu() guarded.

> > Source/WebCore/page/ContextMenuController.cpp:130
> > +    if (!event)
> 
> When does this happen?

This would happen if you call InspectorFrontendHost.showContextMenu() from the front-end JS code without an event. This was how I originally found the issue.

[Antoine Quint]

(In reply to comment #9)
> (In reply to comment #8)
> > (From update of attachment 186066 [details] [details])
> > View in context: https://bugs.webkit.org/attachment.cgi?id=186066&action=review
> > 
> > > Source/WebCore/page/ContextMenuController.cpp:111
> > > +    if (!event)
> > 
> > When does this happen?
> 
> I'm not sure when it would, but I understood from your previous comment you wanted all call sites to ContextMenuController::createContextMenu() guarded.

I guess you meant the actual original call site in the JS code. In this case, WebInspector.ContextMenu.prototype.show().

[Pavel Feldman]

Comment on attachment 186066 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=186066&action=review

>>>> Source/WebCore/page/ContextMenuController.cpp:111
>>>> +    if (!event)
>>> 
>>> When does this happen?
>> 
>> I'm not sure when it would, but I understood from your previous comment you wanted all call sites to ContextMenuController::createContextMenu() guarded.
> 
> I guess you meant the actual original call site in the JS code. In this case, WebInspector.ContextMenu.prototype.show().

Oh, I meant to place the checks into the call sites that operate nullable event pointers. This one does not.

>>> Source/WebCore/page/ContextMenuController.cpp:130
>>> +    if (!event)
>> 
>> When does this happen?
> 
> This would happen if you call InspectorFrontendHost.showContextMenu() from the front-end JS code without an event. This was how I originally found the issue.

You probably want to move this check into the call site (InspectorFrontendHost::showContextMenu) then. That way you clearly separate contexts with nullable event pointers from the ones that rely upon their existence.

[Antoine Quint]

Created attachment 186224 [details]
Patch

[WebKit Review Bot]

Comment on attachment 186224 [details]
Patch

Rejecting attachment 186224 [details] from commit-queue.

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[WebKit Review Bot]

Comment on attachment 186224 [details]
Patch

Clearing flags on attachment: 186224

Committed r141692: <http://trac.webkit.org/changeset/141692>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.