Bug 25933 – Unitialized variable used at WebCore::PluginView::setFrameRect(

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: WebCore Misc.

[xxx]

Valgrind detected an Unitialized variable used at WebCore::PluginView::setFrameRect, and the source value comes from WebCore::PluginView::create

==8572== Conditional jump or move depends on uninitialised value(s)
==8572==    at 0x470EA87: WebCore::PluginView::setFrameRect(WebCore::IntRect const&) (PluginView.cpp:131)
==8572==    by 0x47A5998: WebCore::RenderPart::updateWidgetPosition() (RenderPart.cpp:102)
==8572==    by 0x47D7FB1: WebCore::RenderView::updateWidgetPositions() (RenderView.cpp:501)
==8572==    by 0x469877D: WebCore::FrameView::performPostLayoutTasks() (FrameView.cpp:992)
==8572==    by 0x46974AC: WebCore::FrameView::layout(bool) (FrameView.cpp:617)
==8572==    by 0x46999AE: WebCore::FrameView::visibleContentsResized() (FrameView.h:186)
==8572==    by 0x46EAB9C: WebCore::ScrollView::updateScrollbars(WebCore::IntSize const&) (ScrollView.cpp:342)
==8572==    by 0x46EA53B: WebCore::ScrollView::setContentsSize(WebCore::IntSize const&) (ScrollView.cpp:227)
==8572==    by 0x469696E: WebCore::FrameView::setContentsSize(WebCore::IntSize const&) (FrameView.cpp:355)
==8572==    by 0x4696A70: WebCore::FrameView::adjustViewSize() (FrameView.cpp:370)
==8572==    by 0x46973AE: WebCore::FrameView::layout(bool) (FrameView.cpp:590)
==8572==    by 0x443AB41: WebCore::Document::implicitClose() (Document.cpp:1616)
==8572==    by 0x4608556: WebCore::FrameLoader::checkCallImplicitClose() (FrameLoader.cpp:1348)
==8572==    by 0x46082D2: WebCore::FrameLoader::checkCompleted() (FrameLoader.cpp:1300)
==8572==    by 0x4608104: WebCore::FrameLoader::finishedParsing() (FrameLoader.cpp:1252)
==8572==  Uninitialised value was created by a heap allocation
==8572==    at 0x4024A4E: operator new(unsigned int) (vg_replace_malloc.c:224)
==8572==    by 0x47116F0: WebCore::PluginView::create(WebCore::Frame*, WebCore::IntSize const&, WebCore::Element*, WebCore::KURL const&, WTF::Vector<WebCore
::String, 0u> const&, WTF::Vector<WebCore::String, 0u> const&, WebCore::String const&, bool) (PluginView.cpp:674)
==8572==    by 0x4869339: WebCore::FrameLoaderClientQt::createPlugin(WebCore::IntSize const&, WebCore::Element*, WebCore::KURL const&, WTF::Vector<WebCore::
String, 0u> const&, WTF::Vector<WebCore::String, 0u> const&, WebCore::String const&, bool) (FrameLoaderClientQt.cpp:1139)
==8572==    by 0x460A251: WebCore::FrameLoader::loadPlugin(WebCore::RenderPart*, WebCore::KURL const&, WebCore::String const&, WTF::Vector<WebCore::String,
0u> const&, WTF::Vector<WebCore::String, 0u> const&, bool) (FrameLoader.cpp:1751)
==8572==    by 0x4609E1A: WebCore::FrameLoader::requestObject(WebCore::RenderPart*, WebCore::String const&, WebCore::AtomicString const&, WebCore::String co
nst&, WTF::Vector<WebCore::String, 0u> const&, WTF::Vector<WebCore::String, 0u> const&) (FrameLoader.cpp:1701)
==8572==    by 0x47A6FD9: WebCore::RenderPartObject::updateWidget(bool) (RenderPartObject.cpp:245)
==8572==    by 0x45873C9: WebCore::HTMLObjectElement::updateWidget() (HTMLObjectElement.cpp:167)
==8572==    by 0x4596A87: WebCore::HTMLPlugInElement::updateWidgetCallback(WebCore::Node*) (HTMLPlugInElement.cpp:197)
==8572==    by 0x442E5FA: WebCore::ContainerNode::dispatchPostAttachCallbacks() (ContainerNode.cpp:572)
==8572==    by 0x442E4A3: WebCore::ContainerNode::resumePostAttachCallbacks() (ContainerNode.cpp:551)
==8572==    by 0x4439754: WebCore::Document::recalcStyle(WebCore::Node::StyleChange) (Document.cpp:1170)
==8572==    by 0x4439812: WebCore::Document::updateRendering() (Document.cpp:1186)
==8572==    by 0x44398B9: WebCore::Document::updateDocumentsRendering() (Document.cpp:1204)
==8572==    by 0x446DFAA: WebCore::EventTargetNode::dispatchGenericEvent(WTF::PassRefPtr<WebCore::Event>, int&) (EventTargetNode.cpp:395)
==8572==    by 0x446D909: WebCore::EventTargetNode::dispatchEvent(WTF::PassRefPtr<WebCore::Event>, int&) (EventTargetNode.cpp:273)

[xxx]

I can obtain this callstack with valgrin 3.41  running the test below. 

WebKit-r43887/WebKit/qt/tests/qwebpage> valgrind --track-origins=yes ./tst_qwebpage

However, in this case it uses the WebKit library installed by Qt 4.5.1, instead of the one I build within my WebKit-r43887 folder. Is there anyway I can configure this (or other unit test) to use the compiled webkit lib?
I tried running the tests at WebKit-r43887/Programs/unittests/ , but I'm not sure they do the sam


thanks

[Andreas Kling]

*** This bug has been marked as a duplicate of bug 33468 ***