Branch: refs/heads/webkitglib/2.52
Home: https://github.com/WebKit/WebKit
Commit: 42a5387e1a8807fae47e0a60889d996c5d54e342
https://github.com/WebKit/WebKit/commit/42a5387e1a8807fae47e0a60889d996c5d54e342
Author: Nikolas Zimmermann <[email protected]>
Date: 2026-03-17 (Tue, 17 Mar 2026)
Changed paths:
M Source/WebCore/rendering/RenderTheme.cpp
Log Message:
-----------
Cherry-pick 308546@main (b859116b450c).
https://bugs.webkit.org/show_bug.cgi?id=309006
RenderTheme::updateSliderTrackPart() may divides by zero when computing
datalist tick ratios
https://bugs.webkit.org/show_bug.cgi?id=309006
Reviewed by Simon Fraser.
The tick ratio calculation divides by (maximum - minimum) without guarding
against zero, unlike the thumb position calculation which already performs
this check. When max == min (e.g. max="0"), this produces NaN values that
propagate into SliderTrackPart::drawTicks() creating an unsorted FloatRect.
This fixes a crash in invalid-datalist-options-crash.html (WPT test in
imported/w3c/web-platform-tests/html/semantics/forms/the-input-element) for
the GTK/WPE ports, where the unsorted rect triggers an assertion in
SkCanvas::onDrawRect in SKIA_DEBUG enabled builds.
Covered by existing tests.
* Source/WebCore/rendering/RenderTheme.cpp:
(WebCore::updateSliderTrackPartForRenderer):
Canonical link: https://commits.webkit.org/308546@main
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