Bug 24172 – Reproducible crash in CSSParser::parseFillImage copying contents of this page

• Component: CSS
• Status: RESOLVED FIXED

[Beth Dakin]

Thread 0 Crashed (i386):
>#0   com.apple.WebCore          0x00e30235  WebCore::CSSParser::parseFillImage(WTF::RefPtr<WebCore::CSSValue>&) + 437
  #1   com.apple.WebCore          0x00e30d8f  WebCore::CSSParser::parseFillProperty(int, int&, int&, WTF::RefPtr<WebCore::CSSValue>&, WTF::RefPtr<WebCore::CSSValue>&) + 2575
  #2   com.apple.WebCore          0x00e34b2c  WebCore::CSSParser::parseValue(int, bool) + 7724
  #3   com.apple.WebCore          0x00e1a809  cssyyparse(void*) + 12953
  #4   com.apple.WebCore          0x00e2aa09  WebCore::CSSParser::parseValue(WebCore::CSSMutableStyleDeclaration*, int, WebCore::String const&, bool) + 89
  #5   com.apple.WebCore          0x00e218c5  WebCore::CSSMutableStyleDeclaration::setProperty(int, WebCore::String const&, bool, bool) + 213
  #6   com.apple.WebCore          0x014d0806  WebCore::createMarkup(WebCore::Range const*, WTF::Vector<WebCore::Node*, 0ul>*, WebCore::EAnnotateForInterchange, bool) + 7862
  #7   com.apple.WebCore          0x0127ee37  WebCore::LegacyWebArchive::createFromSelection(WebCore::Frame*) + 135
  #8   com.apple.WebCore          0x012be382  WebCore::Pasteboard::writeSelection(NSPasteboard*, WebCore::Range*, bool, WebCore::Frame*) + 1442
  #9   com.apple.WebCore          0x00f96281  WebCore::Editor::copy() + 273
  #10  com.apple.WebCore          0x00f9e879  __ZN7WebCoreL11executeCopyEPNS_5FrameEPNS_5EventENS_19EditorCommandSourceERKNS_6StringE + 25
  #11  com.apple.WebCore          0x00f9d48e  WebCore::Editor::Command::execute(WebCore::String const&, WebCore::Event*) const + 142
  #12  com.apple.WebKit           0x001c3cd1  -[WebHTMLView executeCoreCommandBySelector:] + 129
  #13  com.apple.AppKit           0x9695cb03  -[NSApplication sendAction:to:from:] + 112
  #14  com.apple.Safari           0x0002d458  -[BrowserApplication sendAction:to:from:] (/SourceCache/WebBrowser/WebBrowser-5525.20.1/mac/BrowserApplication.m:90)
  #15  com.apple.AppKit           0x96a0b540  -[NSMenu performActionForItemAtIndex:] + 493
  #16  com.apple.AppKit           0x96a0b245  -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 220
  #17  com.apple.AppKit           0x96a0aecb  -[NSMenu performKeyEquivalent:] + 866
  #18  com.apple.AppKit           0x96a09770  -[NSApplication _handleKeyEquivalent:] + 492
  #19  com.apple.AppKit           0x96926733  -[NSApplication sendEvent:] + 3999
  #20  com.apple.Safari           0x0002b5d8  -[BrowserApplication sendEvent:] (/SourceCache/WebBrowser/WebBrowser-5525.20.1/mac/BrowserApplication.m:143)
  #21  com.apple.AppKit           0x96883d0f  -[NSApplication run] + 847
  #22  com.apple.AppKit           0x96850f14  NSApplicationMain + 574
  #23  com.apple.Safari           0x000ba4d6  start

[Beth Dakin]

Created attachment 27984 [details]
Reduction

Here is a reduction. To reproduce the crash, load the page in tip of tree WebKit. Press Command-A to select all. Press Command-C to copy. Then you should crash.

This is clearly a null-dereference. I am going to upload a null-check patch momentarily.

[Beth Dakin]

Created attachment 27987 [details]
Null-Check Patch

[Beth Dakin]

This is in Radar as <rdar://problem/6487249>

[Beth Dakin]

Created attachment 27988 [details]
Null-Check Patch with ChangLogs

Oops, forgot a layout tests changelog.

[Darin Adler]

Comment on attachment 27988 [details]
Null-Check Patch with ChangLogs

r=me

[Beth Dakin]

Thanks Darin! Fixed with revision 41231.