Bug 74938 – Web Inspector: CSSStyleSheet::cssRules can return 0 and InspectorStyleSheet dosen't check

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

[Timothy Hatcher]

InspectorStyleSheet looks like it can run into security origin checks in CSSStyleSheet::cssRules. There should be a way to prevent the security origin checks or at the very least catch the null and bail from InspectorStyleSheet.

Steps:
1) Navigate to http://www.theonion.com/articles/circus-train-wreck-not-funny-investigators-emphasi,21252/
2) Select paywall pop-up element and inspect it
3) Add new style rule
4) Press enter to type in new style rule such as "display: none"

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore             	0x00007fff932d4b50 WebCore::CSSRuleList::length() const + 4
1   com.apple.WebCore             	0x00007fff9374c341 WebCore::InspectorStyleSheet::addRule(WTF::String const&) + 181
2   com.apple.WebCore             	0x00007fff9374c0dc WebCore::InspectorCSSAgent::addRule(WTF::String*, int, WTF::String const&, WTF::RefPtr<WebCore::InspectorObject>*) + 82
3   com.apple.WebCore             	0x00007fff9374bba0 WebCore::InspectorBackendDispatcher::CSS_addRule(long, WebCore::InspectorObject*) + 668
4   com.apple.WebCore             	0x00007fff936ef928 WebCore::InspectorBackendDispatcher::dispatch(WTF::String const&) + 14266
5   com.apple.WebCore             	0x00007fff936ec0f6 WebCore::jsInspectorFrontendHostPrototypeFunctionSendMessageToBackend(JSC::ExecState*) + 246
6   ???                           	0x00003e42116011e8 0 + 68453480272360
7   com.apple.JavaScriptCore      	0x00007fff8ffdcf96 JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 1046
8   com.apple.JavaScriptCore      	0x00007fff8ffdcb6d JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 45
9   com.apple.WebCore             	0x00007fff931a349d WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) + 1195
10  com.apple.WebCore             	0x00007fff931a2f74 WebCore::EventTarget::fireEventListeners(WebCore::Event*, WebCore::EventTargetData*, WTF::Vector<WebCore::RegisteredEventListener, 1ul>&) + 494
11  com.apple.WebCore             	0x00007fff930c2393 WebCore::EventTarget::fireEventListeners(WebCore::Event*) + 85
12  com.apple.WebCore             	0x00007fff930c2480 WebCore::Node::handleLocalEvents(WebCore::Event*) + 180
13  com.apple.WebCore             	0x00007fff930c1b04 WebCore::EventDispatcher::dispatchEvent(WTF::PassRefPtr<WebCore::Event>) + 832
14  com.apple.WebCore             	0x00007fff930c1788 WebCore::EventDispatchMediator::dispatchEvent(WebCore::EventDispatcher*) const + 40
15  com.apple.WebCore             	0x00007fff930c1689 WebCore::EventDispatcher::dispatchEvent(WebCore::Node*, WebCore::EventDispatchMediator const&) + 41
16  com.apple.WebCore             	0x00007fff930c15f7 WebCore::Node::dispatchEvent(WTF::PassRefPtr<WebCore::Event>) + 55
17  com.apple.WebCore             	0x00007fff931d7d28 WebCore::Node::dispatchBlurEvent() + 82
18  com.apple.WebCore             	0x00007fff93119a83 WebCore::Document::setFocusedNode(WTF::PassRefPtr<WebCore::Node>) + 251
19  com.apple.WebCore             	0x00007fff931adb4b WebCore::FocusController::setFocusedNode(WebCore::Node*, WTF::PassRefPtr<WebCore::Frame>) + 645
20  com.apple.WebCore             	0x00007fff9326c0ba WebCore::EventHandler::dispatchMouseEvent(WTF::AtomicString const&, WebCore::Node*, bool, int, WebCore::PlatformMouseEvent const&, bool) + 618
21  com.apple.WebCore             	0x00007fff9326f6a5 WebCore::EventHandler::handleMousePressEvent(WebCore::PlatformMouseEvent const&) + 1557
22  com.apple.WebKit2             	0x00007fff902d33fd WebKit::WebPage::mouseEvent(WebKit::WebMouseEvent const&) + 267
23  com.apple.WebKit2             	0x00007fff902f9882 void CoreIPC::handleMessage<Messages::WebPage::MouseEvent, WebKit::WebPage, void (WebKit::WebPage::*)(WebKit::WebMouseEvent const&)>(CoreIPC::ArgumentDecoder*, WebKit::WebPage*, void (WebKit::WebPage::*)(WebKit::WebMouseEvent const&)) + 74
24  com.apple.WebKit2             	0x00007fff90260f26 CoreIPC::Connection::dispatchMessage(CoreIPC::Connection::Message<CoreIPC::ArgumentDecoder>&) + 172
25  com.apple.WebKit2             	0x00007fff90260e3f CoreIPC::Connection::dispatchMessages() + 145
26  com.apple.WebKit2             	0x00007fff9025d77f RunLoop::performWork() + 111

<rdar://problem/10066239>

[Alexander Pavlov (apavlov)]

Created attachment 120162 [details]
Patch

[WebKit Review Bot]

Comment on attachment 120162 [details]
Patch

Clearing flags on attachment: 120162

Committed r103403: <http://trac.webkit.org/changeset/103403>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.