236378 2022-02-09 09:57:10 -0800 Check bidiLevels are valid before reordering 2022-02-10 17:48:58 -0800 1 1 1 Unclassified WebKit Layout and Rendering Other Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 brandonstewart webkit-unassigned bfulgham simon.fraser webkit-bug-importer zalan oldest_to_newest 1839235 0 brandonstewart 2022-02-09 09:57:10 -0800 <rdar://88324745> 1839242 1 451397 brandonstewart 2022-02-09 09:59:43 -0800 Created attachment 451397 Patch 1839524 2 451397 zalan 2022-02-09 20:55:08 -0800 Comment on attachment 451397 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=451397&action=review > Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.cpp:350 > + > + // bidiLevels are required to be less than the MAX + 1, otherwise > + // ubidi_reorderVisual will silently fail. > + if (lineRuns[i].bidiLevel() > UBIDI_MAX_EXPLICIT_LEVEL + 1) > + continue; > + Great patch! What happens here is that 1. an empty DOM text node (length = 0) generates an InlineTextItem with zero length 2. this InlineTextItem gets ignored at InlineItemsBuilder::breakAndComputeBidiLevels() -this is ok, it's hard to assign a bidi level for a 0 length content. 3. this zero length InlineTextItem enters the bidi reordering with the default UBIDI_DEFAULT_LTR value (254, see InlineItem's c'tor) which is greater than UBIDI_MAX_EXPLICIT_LEVEL (125) I'd slightly change this patch by adding the following asserts ASSERT(lineRuns[I].bidiLevel() == UBIDI_DEFAULT_LTR); ASSERT(!downcast<InlineTextItem>(lineRuns[I]).length()); as we do not expect any other type of content with such bidi level. 1839834 3 451579 brandonstewart 2022-02-10 11:16:45 -0800 Created attachment 451579 Patch 1840074 4 ews-feeder 2022-02-10 17:48:54 -0800 Committed r289597 (247110@main): <https://commits.webkit.org/247110@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 451579. 451397 2022-02-09 09:59:43 -0800 2022-02-10 11:16:41 -0800 Patch bug-236378-20220209095942.patch text/plain 1985 brandonstewart U3VidmVyc2lvbiBSZXZpc2lvbjogMjg5Mzg2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggM2E0ODRiZTkzODBhOWNm ZDhkODU4ZGFmZmI0NzZjYTAwZGQ4YmMwYy4uYmNlMGI2Y2QyM2IzOTE0YzA3ODczMjAwZjM3YzUw Mzg0MzY0MGI5NiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE4IEBACisyMDIyLTAyLTA5ICBCcmFu ZG9uIFN0ZXdhcnQgIDxicmFuZG9uc3Rld2FydEBhcHBsZS5jb20+CisKKyAgICAgICAgQ2hlY2sg YmlkaUxldmVscyBhcmUgdmFsaWQgYmVmb3JlIHJlb3JkZXJpbmcKKyAgICAgICAgaHR0cHM6Ly9i dWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIzNjM3OAorCisgICAgICAgIFJldmlld2Vk IGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFdlIHdlcmUgdHJ1c3RpbmcgdGhhdCB0aGUg YmlkaUxldmVsIHdhcyB2YWxpZCBiZWZvcmUgY2FsbGluZyB0aGUgcmVvcmRlci4KKyAgICAgICAg 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