Attempting to inject dll into firefox causes panic

[radiantly]

assertion failed: !injected_module_handle.is_null()
# ...
3: dll_syringe::syringe::LoadLibraryWStub::call
             at dll-syringe-0.17.0\src\syringe.rs:420
4: dll_syringe::syringe::Syringe::inject<ref$<std::path::Path> >
             at dll-syringe-0.17.0\src\syringe.rs:148
5: dll_syringe::syringe::Syringe::find_or_inject<std::path::PathBuf>
             at dll-syringe-0.17.0\src\syringe.rs:180

It looks like this assertion is failing:

dll-syringe/src/syringe.rs

Lines 417 to 420 in cdea464

	Syringe::remote_exit_code_to_error_or_exception(exit_code)?;
	let injected_module_handle = self.result.read()?;
	assert!(!injected_module_handle.is_null());

[OpenByteDev]

Does the error only happen with your specific dll or also with an empty one?

[radiantly]

Thanks @OpenByteDev for the quick response. Yes, I'm still getting a panic for an empty dll (compiled after removing all functions).

Some additional information:

• Injecting the original DLL (source) works fine with other apps (chrome, spotify, notepad, etc).
• I tried injecting a previous version of this dll (built with c++) and can also see a panic (for just firefox).

[radiantly]

@OpenByteDev let me know if you'd like me to create a reproducible example that you could test out on your system

[OpenByteDev]

I can reproduce it, but i have no idea why it does not work.
Firefox shouldn't really block it themselves according to https://hacks.mozilla.org/2023/03/letting-users-block-injected-third-party-dlls-in-firefox/.