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Problem: [security]: heap buffer overflow in set_sofo()
(Yazan Balawneh)
Solution: Reset sl_sal_first (Yasuhiro Matsumoto).
A crafted spell file with an empty SN_SAL section before an SN_SOFO
section reaches set_sofo() with sl_sal_first[] already set to -1 by
set_sal_first(). The counting loop then under-counts colliding
multi-byte "from" characters, allocates an undersized list and writes
past its end.
Github Security Advisory:
https://github.com/vim/vim/security/advisories/GHSA-9jqx-hgpr-6v64
05c41c9223
Co-authored-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>