205925 2020-01-08 06:57:53 -0800 [Web Animations] Stop creating CSS Animations for <noscript> elements 2020-01-08 08:30:49 -0800 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=205929 https://bugs.webkit.org/show_bug.cgi?id=205928 InRadar P2 Normal --- 1 graouts graouts cdumez cmarcelo dbates esprehn+autocc ews-watchlist gyuyoung.kim kangil.han koivisto webkit-bug-importer oldest_to_newest 1604075 0 graouts 2020-01-08 06:57:53 -0800 [Web Animations] Stop creating CSS Animations for <noscript> elements 1604077 1 387103 graouts 2020-01-08 07:02:15 -0800 Created attachment 387103 Patch 1604078 2 graouts 2020-01-08 07:02:20 -0800 <rdar://problem/58158479> 1604089 3 387103 koivisto 2020-01-08 07:41:23 -0800 Comment on attachment 387103 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=387103&action=review > Source/WebCore/ChangeLog:16 > + It makes no sense to create CSS Animations for a <noscript> element and it has the side effect of potential crashes. > + Indeed, AnimationTimeline::updateCSSAnimationsForElement() may be called without a currentStyle and so we never have > + a list of previously-applied animations to compare to the list of animations in afterChangeStyle. So on each call we > + end up creating a new CSSAnimation and the previous animation for the same name is never explicitly removed from the > + effect stack and is eventually destroyed and the WeakPtr for it in the stack ends up being null, which would cause a > + crash under KeyframeEffectStack::ensureEffectsAreSorted(). You'll should add some other defense against this in animation code too as this patch likely doesn't cover all the paths where this can happen. > Source/WebCore/html/HTMLElement.cpp:736 > -bool HTMLElement::rendererIsNeeded(const RenderStyle& style) > +bool HTMLElement::rendererIsEverNeeded() You can also switch HTMLInputElement::rendererIsNeeded to rendererIsEverNeeded, maybe others. Please check, they can probably all be used to get this crash. 1604096 4 koivisto 2020-01-08 08:04:24 -0800 In fact most rendererIsNeeded functions can be turned into rendererIsEverNeeded. Doesn't need to be done in this patch though. 1604100 5 graouts 2020-01-08 08:27:49 -0800 (In reply to Antti Koivisto from comment #3) > Comment on attachment 387103 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=387103&action=review > > > Source/WebCore/ChangeLog:16 > > + It makes no sense to create CSS Animations for a <noscript> element and it has the side effect of potential crashes. > > + Indeed, AnimationTimeline::updateCSSAnimationsForElement() may be called without a currentStyle and so we never have > > + a list of previously-applied animations to compare to the list of animations in afterChangeStyle. So on each call we > > + end up creating a new CSSAnimation and the previous animation for the same name is never explicitly removed from the > > + effect stack and is eventually destroyed and the WeakPtr for it in the stack ends up being null, which would cause a > > + crash under KeyframeEffectStack::ensureEffectsAreSorted(). > > You'll should add some other defense against this in animation code too as > this patch likely doesn't cover all the paths where this can happen. It's more than a defense that is needed, the problem is that `AnimationTimeline` doesn't know to expect several CSS Animations with the same animation-name. I will address this as part of a different bug as soon as possible. I raised https://bugs.webkit.org/show_bug.cgi?id=205928. > > Source/WebCore/html/HTMLElement.cpp:736 > > -bool HTMLElement::rendererIsNeeded(const RenderStyle& style) > > +bool HTMLElement::rendererIsEverNeeded() > > You can also switch HTMLInputElement::rendererIsNeeded to > rendererIsEverNeeded, maybe others. Please check, they can probably all be > used to get this crash. I will add more rendererIsNeeded overrides in a followup, I raised 1604101 6 graouts 2020-01-08 08:28:20 -0800 (In reply to Antoine Quint from comment #5) > I will add more rendererIsNeeded overrides in a followup, I raised … https://bugs.webkit.org/show_bug.cgi?id=205929 1604102 7 graouts 2020-01-08 08:30:49 -0800 Committed r254201: <https://trac.webkit.org/changeset/254201> 387103 2020-01-08 07:02:15 -0800 2020-01-08 07:41:23 -0800 Patch bug-205925-20200108160213.patch text/plain 7720 graouts U3VidmVyc2lvbiBSZXZpc2lvbjogMjU0MTMzCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggOTZkNzVhZDAyOWIyYWVh MzUzN2YyN2JmOGJjYTgwOTM1MGU1NTZkYS4uY2RjNTE1ZDdkNjc3OWU0YTE1MTE0MzM1YzMyNDk0 ODgyN2YwZDNhYSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDMzIEBACisyMDIwLTAxLTA4ICBBbnRv aW5lIFF1aW50ICA8Z3Jhb3V0c0BhcHBsZS5jb20+CisKKyAgICAgICAgW1dlYiBBbmltYXRpb25z 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