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From: john@jetson.upma.md.us (John Owens)
Newsgroups: comp.dcom.telecom
Subject: AT&T Bug (from RISKS)
Message-ID: <4264@accuvax.nwu.edu>
Date: 21 Feb 90 20:04:35 GMT
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X-Telecom-Digest: Volume 10, Issue 123, Message 4 of 5


[If you haven't already seen this, here's the bug in the CCS7 software.]

  From: kent@wsl.dec.com, via db@cs.purdue.edu, via RISKS
  Subject: AT&T Bug
  Date: Fri Jan 19 12:18:33 1990

This is the bug that cause the AT&T breakdown
the other day (no, it wasn't an MCI virus):

In the switching software (written in C), there was a long
"do . . . while" construct, which contained
   a "switch" statement, which contained
      an "if" clause, which contained a
         "break," which was intended for
      the "if" clause, but instead broke from
   the "switch" statement.

["break" never breaks an "if", only "switch"es, "do"s, and "while"s.]