Fix multiline TextInput crash when inserting/removing lots of text#489
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tom-un merged 1 commit intomicrosoft:masterfrom Jul 8, 2020
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It seems that the returned string that we use to set `previousText` can be mutated while it is waiting to be processed by RCTBridge.
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…29307) Summary: Multiline `TextInput` can crash when really long texts are inserted and removed quickly. This is caused by the fact that [`-[NSAttributedString string]`](https://developer.apple.com/documentation/foundation/nsattributedstring/1412616-string?language=objc) doesn't really return a copy, and may mutate the string while it is being used by `convertIdToFollyDynamic`. See microsoft#489 (comment) for more details on the issue. This issue was originally reported in microsoft#486 and was fixed in microsoft#489. ## Changelog [iOS] [Fixed] - Fix multiline TextInput crash when inserting/removing lots of text Pull Request resolved: #29307 Test Plan: 1. Open RNTester > TextInput 2. Search for a multiline example 3. Copy some large text and paste it into the text input view 4. Remove some (or all) text 5. Repeat steps 3-4 Reviewed By: shergin Differential Revision: D22488854 Pulled By: JoshuaGross fbshipit-source-id: 6fab7818d68538450d93460361ff5934caf86c10
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…w and RCTEventDispatcher Summary: A crash encountered in react-native-macOS is very similar to one fixed by microsoft#489 (comment) (see discussion), and it's possible this `replacement` string also suffers from sharing the same backing store as the attributed string (maybe only when the range encompasses the entire string?) and therefore should be copied as well. Changelog: [iOS][Fixed] - Possible fix for convertIdToFollyDynamic crash in RCTBaseTextInputView and RCTEventDispatcher Reviewed By: sammy-SC Differential Revision: D38064551 fbshipit-source-id: 9c15f2a980155ab3cbb3fde79fcb93b24ee2091a
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Summary
It seems that the returned string that we use to set
previousTextcan be mutated while it is waiting to be processed byRCTBridge.Resolves #486
Changelog
[macOS] [Fixed] - Fix multiline
TextInputcrash when inserting/removing lots of textTest Plan
Here's a screenshot showing that the length of
previousText(0x600000d952c0) was 29483 when first accessed, but is 0 when the exception is thrown.Microsoft Reviewers: Open in CodeFlow