[Webkit-unassigned] [Bug 148410] New: Fix crash due to search field disappearing when showing results menu

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148410

            Bug ID: 148410
           Summary: Fix crash due to search field disappearing when
                    showing results menu
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com

Created attachment 259800
  --> https://bugs.webkit.org/attachment.cgi?id=259800&action=review
Click on the results button to crash WebKit

When an input of type search has a results attribute and is set up to disappear (e.g. display: none) when focused, clicking on the search field will crash WebKit since we assume that, after running the handler code, the search field's renderer will still exist. We use the renderer to then toggle the search results popup. This fix guards this logic with a check to make sure that the renderer still exists when handling an event on the search field results button.

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