227738 2021-07-06 23:39:31 -0700 Defend against stack overflow in GraphicsLayerCA::recursiveCommitChanges 2021-07-08 15:17:48 -0700 1 1 1 Unclassified WebKit Compositing WebKit Local Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 heycam heycam simon.fraser webkit-bug-importer oldest_to_newest 1775222 0 heycam 2021-07-06 23:39:31 -0700 It looks like GraphicsLayerCA::recursiveCommitChanges can cause a stack overflow in some configurations. We already have CommitState::treeDepth, which we use to avoid creating deep CALayer trees, so we should be able to stop the recursion at the same level. 1775223 1 heycam 2021-07-06 23:39:57 -0700 <rdar://42584284> 1775225 2 heycam 2021-07-06 23:49:02 -0700 All CommitState::treeDepth does currently is avoid hooking up the too-deep PlatformCALayers to their intended parents. I'm slightly concerned with leaving other aspects of the PlatformCALayers out of date, though most of the LayerChange reasons are just about rendering, geometry, etc., and shouldn't be a big deal, especially when not hooked up. ScrollingNodeChanged is a bit different, but we tend to check for scrolling node ID validity when we use them. Another concern is that the treeDepth counts structural layers, and so a given GraphicsLayerCA may be too deep in one call to recursiveCommitChanges, and not be too deep the next. In such a case we should then continue to process the old m_uncommittedChanges on the children, so that should be OK? 1775575 3 433107 heycam 2021-07-07 19:01:53 -0700 Created attachment 433107 Patch 1775617 4 433120 heycam 2021-07-07 23:28:55 -0700 Created attachment 433120 Patch 1775822 5 ews-feeder 2021-07-08 15:17:47 -0700 Committed r279756 (239529@main): <https://commits.webkit.org/239529@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433120. 433107 2021-07-07 19:01:53 -0700 2021-07-07 23:28:51 -0700 Patch bug-227738-20210708120152.patch text/plain 8395 heycam U3VidmVyc2lvbiBSZXZpc2lvbjogMjc5NTU5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMGE1ZjdmNmY0N2ZhMDI3 NWU2N2U0ODQyMGJjMmE2OGJhNWE5NWZmMC4uNTczNWE4MjI4NGVhYmFjOWNjZDVhZTgwMjdmNzc3 YWFkMDE4NjdkOSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDM4IEBACisyMDIxLTA3LTA3ICBDYW1l cm9uIE1jQ29ybWFjayAgPGhleWNhbUBhcHBsZS5jb20+CisKKyAgICAgICAgU3RvcCBHcmFwaGlj c0xheWVyQ0E6OnJlY3Vyc2l2ZUNvbW1pdENoYW5nZXMgcmVjdXJzaW9uIG9uY2UgY01heExheWVy VHJlZURlcHRoIGlzIHJlYWNoZWQKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hv d19idWcuY2dpP2lkPTIyNzczOAorICAgICAgICA8cmRhcjovLzQyNTg0Mjg0PgorCisgICAgICAg IFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFRvIGF2b2lkIHN0YWNrIG92 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