Andreas Kling 5da72570b8 LibWeb: Harden UA event handlers on range and number inputs ...

These handlers crashed on several kinds of JS-dispatched input:
zero-width range (divide by zero in the slider mouse handler),
step="any" (MUST(step_up) throws InvalidStateError), plain Event
without clientX/deltaY/key (unchecked as_foo() asserts on
undefined), min > max (trips clamp()'s VERIFY), and input.type
changes leaving the range listeners attached to dereference empty
Optionals from the range-only min()/max() accessors.

Gate each handler on its expected type_state() and on
allowed_value_step() having a value, validate event property types
before converting, and bail out on zero-width rects or min > max.
Six crash tests cover the new paths.

Hit on a Cloudflare challenge page.

2026-04-24 07:58:34 +02:00

178 KiB

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