RESOLVED FIXED302069
_ willStartRenderingUpdateDisplay crashes when _private->page is null 
https://bugs.webkit.org/show_bug.cgi?id=302069
Summary _ willStartRenderingUpdateDisplay crashes when _private->page is null
jlee53
Reported 2025-11-06 02:01:33 PST
In the function WebView::_willStartRenderingUpdateDisplay (in WebkitLegacy), the page can become null between when it is originally null-checked if (_private->page) and when willStartRenderingUpdateDisplay starts executing. This is due to an increased delay from WebThreadLock(); We should move WebThreadLock() before page->willStartRenderingUpdateDisplay starts executing so that the page cannot be manipulated by the WebThread before page->willStartRenderingUpdateDisplay runs.
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Add attachment proposed patch, testcase, etc.
jlee53
Comment 1 2025-11-06 02:02:23 PST
<rdar://problem/164022564>
jlee53
Comment 2 2025-11-06 02:06:32 PST
Pull request: https://github.com/apple/WebKit/pull/3986
Robert Jenner
Comment 3 2025-12-15 20:14:39 PST
<rdar://problem/166335789>
Robert Jenner
Comment 4 2025-12-15 20:15:04 PST
Pull request: https://github.com/WebKit/WebKit/pull/55454
EWS
Comment 5 2025-12-16 08:32:51 PST
Committed 304517@main (41c6f81fa853): <https://commits.webkit.org/304517@main> Reviewed commits have been landed. Closing PR #55454 and removing active labels.
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