[Webkit-unassigned] [Bug 57487] New: chrome.dll!WebCore::RenderBlock::findNextLineBreak ReadAV at NULL (bb0085b7cdfcb99eb1362265d1fea9f0)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=57487

           Summary: chrome.dll!WebCore::RenderBlock::findNextLineBreak
                    ReadAV at NULL (bb0085b7cdfcb99eb1362265d1fea9f0)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skylined at chromium.org
                CC: eric at webkit.org


Created an attachment (id=87583)
 --> (https://bugs.webkit.org/attachment.cgi?id=87583&action=review)
Repro

Chromium: http://code.google.com/p/chromium/issues/detail?id=77933
Repro:
<details><style>:first-line{ -webkit-perspective-origin:3;}</style>

webcore\rendering\renderblocklinelayout.cpp:
InlineIterator RenderBlock::findNextLineBreak(InlineBidiResolver& resolver, bool firstLine, bool& isLineEmpty, LineBreakIteratorInfo& lineBreakIteratorInfo, bool& previousLineBrokeCleanly, 
                                              bool& hyphenated, EClear* clear, FloatingObject* lastFloatFromPreviousLine, Vector<RenderBox*>& positionedBoxes)
{
<snip>
            RenderStyle* style = t->style(firstLine);
            if (style->hasTextCombine() && o->isCombineText())
style is NULL, causing a NULL ptr read accessv violation:

id:             chrome.dll!WebCore::RenderBlock::findNextLineBreak ReadAV at NULL (bb0085b7cdfcb99eb1362265d1fea9f0)
description:    Attempt to read from unallocated NULL pointer+0x1C in chrome.dll!WebCore::RenderBlock::findNextLineBreak
stack:          chrome.dll!WebCore::RenderBlock::findNextLineBreak
                chrome.dll!WebCore::RenderBlock::layoutInlineChildren
                chrome.dll!WebCore::RenderBlock::layoutBlock
                chrome.dll!WebCore::RenderBlock::layout
                chrome.dll!WebCore::RenderBlock::layoutBlockChild
                chrome.dll!WebCore::RenderBlock::layoutBlockChildren
                chrome.dll!WebCore::RenderBlock::layoutBlock
                chrome.dll!WebCore::RenderBlock::layout
                chrome.dll!WebCore::RenderBlock::layoutBlockChild
                chrome.dll!WebCore::RenderBlock::layoutBlockChildren
                chrome.dll!WebCore::RenderBlock::layoutBlock
                chrome.dll!WebCore::RenderBlock::layout
                chrome.dll!WebCore::RenderDetails::layout
                chrome.dll!WebCore::RenderBlock::layoutBlockChild
                chrome.dll!WebCore::RenderBlock::layoutBlockChildren
                chrome.dll!WebCore::RenderBlock::layoutBlock
                chrome.dll!WebCore::RenderBlock::layout
                chrome.dll!WebCore::RenderBlock::layoutBlockChild
                chrome.dll!WebCore::RenderBlock::layoutBlockChildren
                chrome.dll!WebCore::RenderBlock::layoutBlock
                chrome.dll!WebCore::RenderBlock::layout
                chrome.dll!WebCore::RenderBlock::layoutBlockChild
                chrome.dll!WebCore::RenderBlock::layoutBlockChildren
                chrome.dll!WebCore::RenderBlock::layoutBlock
                chrome.dll!WebCore::RenderBlock::layout
                chrome.dll!WebCore::RenderView::layout
                chrome.dll!WebCore::FrameView::layout
                chrome.dll!WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive
                chrome.dll!RenderWidget::DoDeferredUpdate
                chrome.dll!RenderWidget::CallDoDeferredUpdate
                chrome.dll!MessageLoop::RunTask
                chrome.dll!MessageLoop::DoWork
                chrome.dll!base::MessagePumpDefault::Run
                chrome.dll!MessageLoop::RunInternal
                chrome.dll!MessageLoop::Run
                chrome.dll!RendererMain

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