telnetd: fix two-byte input crash
Move initialization of the slc table earlier so it doesn't get accessed before that happens. For details on the issue, see: https://pierrekim.github.io/blog/2022-08-24-2-byte-dos-freebsd-netbsd-telnetd-netkit-telnetd-inetutils-telnetd-kerberos-telnetd.html Reviewed by: cy Obtained from: NetBSD via cy Differential Revision: https://reviews.freebsd.org/D36680
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@ -658,6 +658,11 @@ doit(struct sockaddr *who)
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int err_; /* XXX */
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int ptynum;
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/*
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* Initialize the slc mapping table.
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*/
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get_slc_defaults();
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/*
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* Find an available pty to use.
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*/
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@ -741,11 +746,6 @@ telnet(int f, int p, char *host)
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struct stat statbuf;
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int nfd;
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/*
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* Initialize the slc mapping table.
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*/
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get_slc_defaults();
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/*
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* Do some tests where it is desireable to wait for a response.
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* Rather than doing them slowly, one at a time, do them all
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