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Fix crash when setting custom property on Location (#36494)

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The JS engine uses types like `Handle<Maybe<PropertyDescriptor>>` in
various places and our automated bindings are not able to handle the
Maybe type. We have hand-written bindings that use outparams to indicate
a PropertyDescriptor value is actually the Nothing type, but that data
was getting lost when we passed the property descriptor to
SetPropertyIgnoringNamedGetter, which assumed that the property
descriptor was always valid.

Depends on https://github.com/servo/mozjs/pull/579.

Testing: Manual testing on testcase from
https://github.com/servo/servo/issues/34709, and new crashtest added.
Fixes: #34709

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-04-16 02:52:48 -04:00 • committed by GitHub
parent f5e6eb289a
commit 9aa09d73b5
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7 changed files with 21 additions and 13 deletions
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7
components/script_bindings/proxyhandler.rs
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@ -565,13 +565,18 @@ pub(crate) unsafe extern "C" fn maybe_cross_origin_set_rawcx<D: DomTypes>(
return false;
}
let own_desc_handle = own_desc.handle().into();
js::jsapi::SetPropertyIgnoringNamedGetter(
*cx,
proxy,
id,
v,
receiver,
own_desc.handle().into(),
if is_none {
ptr::null()
} else {
&own_desc_handle
},
result,
)
}