[Webkit-unassigned] [Bug 191359] New: Crash in WebCore::ComplexTextController::collectComplexTextRunsForCharacters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191359

            Bug ID: 191359
           Summary: Crash in
                    WebCore::ComplexTextController::collectComplexTextRuns
                    ForCharacters
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: erezg at microsoft.com

Created attachment 354088

  --> https://bugs.webkit.org/attachment.cgi?id=354088&action=review

crash log

Starting iOS 12.1, we got a crash when a user opens a selection box.
It reproduces on physical devices and in the simulator.
Also reproduces with the latest commit in the WebKit codebase (58b77476e97e5bdc3461373948a05b53f15897ab).

For a reproduction:

- Open in iPhone simulator Mobile Safari:
- https://app.powerbi.com/groups/me/rdlreports/5aac3f35-f0e3-4ba0-911b-59e582d07395
- Sign in with
  * user: wktest at CdsaWestEurope.onmicrosoft.com
  * pass: WebKit!1
- after finishing the sign-in process, you'll need to wait until a form appears as the attached screenshot.
- Select the bottom "All Employees" selection box and tap "Select All".
- The WebContent process crashes.

Thanks a lot in advance!

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