https://gitlab.synchro.net/main/sbbs/-/commit/bd725db622999e7311ab340e
Modified Files:
src/sbbs3/getmsg.cpp
Log Message:
Paranoia around use of smb.subnum as an index into scfg.sub[]

Use the is_valid_subnum() function before using the smb.subnum as an index into (s)cfg.sub[]. Related to the previous committed fix of writemsg(): leaving the global smb.subnum as -1 (INVALID_SUB) after replying to a post via email or netmail, resulting in a crash here.

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