[Webkit-unassigned] [Bug 176307] New: Crash in WebCore::CSSSelector::match

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176307

            Bug ID: 176307
           Summary: Crash in WebCore::CSSSelector::match
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com

Created attachment 319780

  --> https://bugs.webkit.org/attachment.cgi?id=319780&action=review

Backtrace

I have only one report of this crash in WebCore::CSSSelector::match. The user says it occurred when loading github.com:

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 WebCore::CSSSelector::match at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/CSSSelector.h:315
 #1 WebCore::CSSSelector::matchesPseudoElement at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/CSSSelector.h:414
 #2 WebCore::selectorCanMatchPseudoElement at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/RuleSet.cpp:85
 #4 WebCore::RuleData::RuleData at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/RuleSet.cpp:159
 #5 WebCore::RuleSet::addRule at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/RuleSet.cpp:199
 #6 WebCore::RuleSet::addStyleRule at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/RuleSet.cpp:429
 #7 WebCore::RuleSet::addChildRules at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/RuleSet.cpp:379
 #8 WebCore::RuleSet::addRulesFromSheet at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/RuleSet.cpp:420
 #9 WebCore::DocumentRuleSets::appendAuthorStyleSheets at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/DocumentRuleSets.cpp:96
 #10 WebCore::StyleResolver::appendAuthorStyleSheets at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/StyleResolver.cpp:282

Better backtrace attached.

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