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> > I found a heap buffer overflow which can cause a heap double free error.
> [...]

The problem seems to be the use of the EXTRA_STACK at luaG_errormsg.
luaG_errormsg calls luaD_callnoyield, which calls luaD_precall, which
checks the stack and grows it if needed. However, there can be an error
before that, in luaE_checkcstack. If luaE_checkcstack raises an error
(C stack overflow), then luaG_errormsg will be called again without any
stack check in-between, and then it will again assume EXTRA_STACK and
that may cause a buffer overflow.

-- Roberto