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Author SHA1 Message Date
Linus Groh
41837f548d LibJS: Don't create "valid" PropertyName from null string 
When value.to_string() throws an exception it returns a null string in
which case we must not construct a valid PropertyName.

Also ASSERT in PropertyName(String) and PropertyName(FlyString) to
prevent this from happening in the future.

Fixes #3941.
 2020-11-04 15:31:39 +01:00
Linus Groh
568d53c9b1 LibJS: Check validity of computed_property_name() result before using it 
This fixes two cases obj[expr] and obj[expr]() (MemberExpression and
CallExpression respectively) when expr throws an exception and results
in an empty value, causing a crash by passing the invalid PropertyName
created by computed_property_name() to Object::get() without checking it
first.

Fixes #3459.
 2020-09-12 11:29:39 +02:00