RESOLVED FIXED308679
[Site Isolation] WebFrame::url() returns null in dispatchDidCommitLoad during process swap. 
https://bugs.webkit.org/show_bug.cgi?id=308679
Summary [Site Isolation] WebFrame::url() returns null in dispatchDidCommitLoad during...
Basuke Suzuki
Reported 2026-02-25 16:13:14 PST
In dispatchDidCommitLoad, commitProvisionalFrame() is called after the InjectedBundle and sandbox extension callbacks. Before that call, m_coreFrame still points to a RemoteFrame, so WebFrame::url() fails the LocalFrame downcast and returns a null URL. Move commitProvisionalFrame() to the top of dispatchDidCommitLoad so m_coreFrame is updated before any code that depends on it. This is safe for the non-Site-Isolation path because commitProvisionalFrame() is a no-op when there is no provisional frame.
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Basuke Suzuki
Comment 1 2026-02-25 16:14:26 PST
rdar://169559232
Basuke Suzuki
Comment 2 2026-02-26 10:34:11 PST
Pull request: https://github.com/WebKit/WebKit/pull/59525
EWS
Comment 3 2026-02-27 21:07:15 PST
Committed 308382@main (726af0edf132): <https://commits.webkit.org/308382@main> Reviewed commits have been landed. Closing PR #59525 and removing active labels.
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