210004 2020-04-04 09:20:48 -0700 Nullptr crash in CompositeEditCommand::splitTreeToNode when inserting image in anchor element that has uneditable parent 2020-04-06 23:29:31 -0700 1 1 1 Unclassified WebKit HTML Editing WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 shihchieh_lee shihchieh_lee bfulgham ews-feeder ews-watchlist mifenton product-security rniwa webkit-bug-importer wenson_hsieh oldest_to_newest 1637689 0 shihchieh_lee 2020-04-04 09:20:48 -0700 <rdar://61206583> 1637690 1 shihchieh_lee 2020-04-04 09:21:46 -0700 #0 0x15836d155 in WebCore::CompositeEditCommand::splitTreeToNode(WebCore::Node&, WebCore::Node&, bool) (Safari_ASAN_259384_90de49be478170ac8513448015dcb21abd3583ea.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3512155) #1 0x158439bf5 in WebCore::ReplaceSelectionCommand::doApply() (Safari_ASAN_259384_90de49be478170ac8513448015dcb21abd3583ea.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x35debf5) #2 0x1583451d6 in WebCore::CompositeEditCommand::apply() (Safari_ASAN_259384_90de49be478170ac8513448015dcb21abd3583ea.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x34ea1d6) #3 0x158401dc1 in WebCore::executeInsertFragment(WebCore::Frame&, WTF::Ref<WebCore::DocumentFragment, WTF::DumbPtrTraits<WebCore::DocumentFragment> >&&) (Safari_ASAN_259384_90de49be478170ac8513448015dcb21abd3583ea.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x35a6dc1) #4 0x1584020d2 in WebCore::executeInsertNode(WebCore::Frame&, WTF::Ref<WebCore::Node, WTF::DumbPtrTraits<WebCore::Node> >&&) (Safari_ASAN_259384_90de49be478170ac8513448015dcb21abd3583ea.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x35a70d2) #5 0x1583fba54 in WebCore::executeInsertImage(WebCore::Frame&, WebCore::Event*, WebCore::EditorCommandSource, WTF::String const&) (Safari_ASAN_259384_90de49be478170ac8513448015dcb21abd3583ea.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x35a0a54) #6 0x158074f47 in WebCore::Document::execCommand(WTF::String const&, bool, WTF::String const&) (Safari_ASAN_259384_90de49be478170ac8513448015dcb21abd3583ea.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3219f47) 1637703 2 395455 shihchieh_lee 2020-04-04 10:13:22 -0700 Created attachment 395455 Patch 1637704 3 shihchieh_lee 2020-04-04 10:19:45 -0700 (In reply to Jack from comment #2) > Created attachment 395455 [details] > Patch When inserting image in anchor we try to push down the anchor element by first moving anchor's children to its parent. If anchor's parent is uneditable, the move fails and leaves the children dangling and parentless. Later the code crashes when function splitTreeToNode dereferences the parent of the dangling children. RemoveNodePreservingChildren can fail and leave the children dangling if the parent of the node is uneditable. Added editability check for the to-be-removed node. Also pushAnchorElementDown would fail silently and we cannot avoid anchor element in function positionAvoidingSpecialElementBoundary. Added check for same enclosing anchor and return empty Position to the caller. Lastly in ReplaceSelectionCommand, added check for empty Position returned by positionAvoidingSpecialElementBoundary and terminate the command. 1637785 4 395469 shihchieh_lee 2020-04-04 17:39:57 -0700 Created attachment 395469 Patch 1638244 5 395469 rniwa 2020-04-06 12:37:46 -0700 Comment on attachment 395469 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395469&action=review > Source/WebCore/editing/CompositeEditCommand.cpp:1724 > + Element* newEnclosingAnchor = enclosingAnchorElement(original); > + if (newEnclosingAnchor != enclosingAnchor) > + enclosingAnchor = newEnclosingAnchor; > + else > + return { }; What is this change about? It should be explained in the change log as a per function comment. I don't think this function is ever supposed to return null position like this. See lines below where we set result to original if result is null. r- because of this. > Source/WebCore/editing/RemoveNodePreservingChildrenCommand.cpp:44 > + ContainerNode* parent = m_node->parentNode(); Please use makeRefPtr and auto. 1638265 6 shihchieh_lee 2020-04-06 13:09:17 -0700 Thanks. I added a comment in the log but not under the function. Do you mean this is where it should go? (WebCore::CompositeEditCommand::positionAvoidingSpecialElementBoundary): Also pushAnchorElementDown would fail silently and we cannot avoid anchor element in function positionAvoidingSpecialElementBoundary. Added check for same enclosing anchor and return empty Position to the caller. (In reply to Ryosuke Niwa from comment #5) > Comment on attachment 395469 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=395469&action=review > > > Source/WebCore/editing/CompositeEditCommand.cpp:1724 > > + Element* newEnclosingAnchor = enclosingAnchorElement(original); > > + if (newEnclosingAnchor != enclosingAnchor) > > + enclosingAnchor = newEnclosingAnchor; > > + else > > + return { }; > > What is this change about? It should be explained in the change log as a per > function comment. > I don't think this function is ever supposed to return null position like > this. > See lines below where we set result to original if result is null. > r- because of this. > > > Source/WebCore/editing/RemoveNodePreservingChildrenCommand.cpp:44 > > + ContainerNode* parent = m_node->parentNode(); > > Please use makeRefPtr and auto. 1638305 7 rniwa 2020-04-06 14:14:44 -0700 (In reply to Jack from comment #6) > Thanks. I added a comment in the log but not under the function. Do you mean > this is where it should go? > > (WebCore::CompositeEditCommand::positionAvoidingSpecialElementBoundary): > Also pushAnchorElementDown would fail silently and we cannot avoid > anchor element in function positionAvoidingSpecialElementBoundary. Added > check for same enclosing anchor and return empty Position to the caller. Yes, although it should start after : in the first line. Regardless, we shouldn't be returning null Position there. 1638312 8 shihchieh_lee 2020-04-06 14:24:01 -0700 Thanks. Yeah, I thought about that too and experimented with returning original position. The insertion command will continue and insert the image in anchor element without avoiding it. Therefore I thought if we return empty position, the caller can terminate the command earlier. Or is it okay just to let the image be inserted? > (In reply to Ryosuke Niwa from comment #5) > > Comment on attachment 395469 [details] > > Patch > > I don't think this function is ever supposed to return null position like > > this. > > See lines below where we set result to original if result is null. > > r- because of this. > > > > > Source/WebCore/editing/RemoveNodePreservingChildrenCommand.cpp:44 > > > + ContainerNode* parent = m_node->parentNode(); > > 1638318 9 rniwa 2020-04-06 14:31:04 -0700 (In reply to Jack from comment #8) > Thanks. Yeah, I thought about that too and experimented with returning > original position. The insertion command will continue and insert the image > in anchor element without avoiding it. Therefore I thought if we return > empty position, the caller can terminate the command earlier. > > Or is it okay just to let the image be inserted? Yes. That's the exiting fallback path anyway for when the position becomes null. 1638320 10 rniwa 2020-04-06 14:31:28 -0700 There is no security implication here. 1638322 11 shihchieh_lee 2020-04-06 14:32:45 -0700 I see. Thanks! (In reply to Ryosuke Niwa from comment #9) > (In reply to Jack from comment #8) > > Thanks. Yeah, I thought about that too and experimented with returning > > original position. The insertion command will continue and insert the image > > in anchor element without avoiding it. Therefore I thought if we return > > empty position, the caller can terminate the command earlier. > > > > Or is it okay just to let the image be inserted? > > Yes. That's the exiting fallback path anyway for when the position becomes > null. 1638366 12 395629 shihchieh_lee 2020-04-06 16:33:15 -0700 Created attachment 395629 Patch 1638466 13 ews-feeder 2020-04-06 23:29:30 -0700 Committed r259624: <https://trac.webkit.org/changeset/259624> All reviewed patches have been landed. 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