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Fix telnetd crash if the first two bytes of a new connection are 0xff 0xf7 (IAC EC) or 0xff 0xf8 (IAC EL). CVE: CVE-2022-39028 (From OE-Core rev: 1c385e70d4bfab2334361ba82f29988bb11d6902) Signed-off-by:Minjae Kim <flowergom@gmail.com> Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>