[Webkit-unassigned] [Bug 160362] NULL Reference Error in ElementRuleCollector

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160362

--- Comment #6 from Jonathan Bedard <jbedard at apple.com> ---
(In reply to comment #5)
> > undefined behavior, although surprisingly, many of the tests which exhibit
> > this (canvas/philip/tests/2d.strokeRect.path.html, for example) still pass.
> 
> Null pointer dereference always crashes. How do the tests "exhibit" this?

This bug was found through open source clang's undefined behavior sanitizer.  As far as I can tell, a reference is being bound to a dereferenced NULL pointer but then this reference is never used.  If the reference were used, we would see a crash.

Tests "exhibit" this (not even sure if that's the right way to describe this) when the undefined behavior sanitizer flags the reference being bound to a dereferenced NULL pointer during runtime.

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