[webkit-changes] [WebKit/WebKit] 9b2b18: Nullptr crash under CustomPropertyRegistry::regist...

[Antti Koivisto]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 9b2b18b8126202d1797a448492781b9242d3ba77
      https://github.com/WebKit/WebKit/commit/9b2b18b8126202d1797a448492781b9242d3ba77
  Author: Antti Koivisto <antti at apple.com>
  Date:   2023-01-22 (Sun, 22 Jan 2023)

  Changed paths:
    A LayoutTests/fast/css/at-property-registration-crash-expected.txt
    A LayoutTests/fast/css/at-property-registration-crash.html
    M Source/WebCore/style/CustomPropertyRegistry.cpp

  Log Message:
  -----------
  Nullptr crash under CustomPropertyRegistry::registerFromStylesheet
https://bugs.webkit.org/show_bug.cgi?id=250981
rdar://104474736

Reviewed by Alan Baradlay.

* LayoutTests/fast/css/at-property-registration-crash-expected.txt: Added.
* LayoutTests/fast/css/at-property-registration-crash.html: Added.
* Source/WebCore/style/CustomPropertyRegistry.cpp:
(WebCore::Style::CustomPropertyRegistry::registerFromStylesheet):

Use the default style instead of getting the root style from the style resolver.
It might not exist yet and is not needed to resolve computationally independent values.

Canonical link: https://commits.webkit.org/259188@main