[Webkit-unassigned] [Bug 196059] New: Leak of SVGFontFaceElement when RenderStyle holds onto a FontRances which uses it
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Mar 20 23:14:05 PDT 2019
https://bugs.webkit.org/show_bug.cgi?id=196059
Bug ID: 196059
Summary: Leak of SVGFontFaceElement when RenderStyle holds onto
a FontRances which uses it
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Keywords: InRadar
Severity: Normal
Priority: P2
Component: SVG
Assignee: webkit-unassigned at lists.webkit.org
Reporter: rniwa at webkit.org
CC: zimmermann at kde.org
SVGFontFaceElement keeps its RenderStyle alive via ElementRareData
but RenderStyle can hold onto FontRanges and therefore CSSFontSource,
which in turn keeps SVGFontFaceElement alive, making a reference cycle.
Complete cycle:
SVGFontFaceElement (1) -> ElementRareData -> StyleInheritedData -> FontCascade -> FontCascadeFonts (2)
FontCascadeFonts (2) -> FontRanges (3)
FontCascadeFonts (2) -> CSSFontSelector -> CSSFontFaceSet -> CSSSegmentedFontFace -> FontRanges (3)
FontRanges (3) -> CSSFontAccessor > CSSFontFace > CSSFontSource -> SVGFontFaceElement (1)
<rdar://problem/47562909>
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