Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 52c5546da56a8bef8e28997ce8c14bb6e15ebde6
https://github.com/WebKit/WebKit/commit/52c5546da56a8bef8e28997ce8c14bb6e15ebde6
Author: Abrar Rahman Protyasha <[email protected]>
Date: 2026-03-03 (Tue, 03 Mar 2026)
Changed paths:
M Source/WebKit/UIProcess/mac/WKPrintingView.mm
Log Message:
-----------
UI process may crash due to WebPageProxy null deref under -[WKPrintingView
_adjustPrintingMarginsForHeaderAndFooter]
https://bugs.webkit.org/show_bug.cgi?id=309020
rdar://165531670
Reviewed by Lily Spiniolas.
We have observed crashes under -_adjustPrintingMarginsForHeaderAndFooter
where we make an invalid address read at 0x78. This corresponds to the
m_uiClient member in WebPageProxy, which we dereference in header/footer
height computation methods, implying we perform a null dereference on
the WebPageProxy instance from WKPrintingView.
In this patch, we avoid this crash by doing a null check first.
* Source/WebKit/UIProcess/mac/WKPrintingView.mm:
(-[WKPrintingView _adjustPrintingMarginsForHeaderAndFooter]):
Canonical link: https://commits.webkit.org/308577@main
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