[Webkit-unassigned] [Bug 181316] New: SVGAnimatedListPropertyTearOff::synchronizeWrappersIfNeeded() should do nothing if the property is not animating
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Jan 4 20:36:44 PST 2018
https://bugs.webkit.org/show_bug.cgi?id=181316
Bug ID: 181316
Summary: SVGAnimatedListPropertyTearOff::synchronizeWrappersIfN
eeded() should do nothing if the property is not
animating
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: SVG
Assignee: webkit-unassigned at lists.webkit.org
Reporter: sabouhallawa at apple.com
CC: zimmermann at kde.org
If SVGAnimatedListPropertyTearOff is not animating this means its m_animatedProperty is null. In this case SVGAnimatedListPropertyTearOff::synchronizeWrappersIfNeeded() should do nothing. Otherwise a crash will happen.
SVGAnimatedListPropertyTearOff::synchronizeWrappersIfNeeded() can now be called from SVGAnimatedTypeAnimator::resetFromBaseValue() and a very intermittent crash with the following call stack was recorded:
WebCore::SVGListProperty<WebCore::SVGTransformListValues>::values()
WebCore::SVGAnimatedListPropertyTearOff<WebCore::SVGTransformListValues>::synchronizeWrappersIfNeeded()
WebCore::SVGAnimatedTypeAnimator::resetFromBaseValue<WebCore::SVGAnimatedTransformListPropertyTearOff>()
WebCore::SVGAnimatedTransformListAnimator::resetAnimValToBaseVal()
WebCore::SVGAnimateElementBase::resetAnimatedType()
The crash was happening because SVGAnimatedListPropertyTearOff::m_animatedProperty is null.
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