The check length path > unixPathMax seems wrong:

• It should be >= because there needs to be a Byte available for the trailing \0.
• The comparison is made on Unicode chars (String) instead of C chars (Bytes)

https://hackage.haskell.org/package/network-3.2.1.0/docs/Network-Socket.html#v:SockAddrUnix says

The path must have fewer than 104 characters. All of these characters must have code points less than 256.

but the check should enforce this properly.