Fix: Potential Vulnerability in Cloned Function #4691
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When shrinking a stack (during GC), do not make it smaller than the initial stack size.
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Description
This PR fixes a security vulnerability in luaD_shrinkstack() that was cloned from lua but did not receive the security patch. The original issue was reported and fixed under lua/lua@6298903.
This PR applies the same patch to eliminate the vulnerability.
References
https://nvd.nist.gov/vuln/detail/CVE-2020-15888
lua/lua@6298903