GNU bug report logs - #37585
Undefined behavior in nl, print_lineno

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Package: coreutils;

Reported by: Roland Illig <roland.illig <at> gmx.de>

Date: Wed, 2 Oct 2019 14:52:02 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Roland Illig <roland.illig <at> gmx.de>
To: bug-coreutils <at> gnu.org
Subject: Undefined behavior in nl, print_lineno
Date: Wed, 2 Oct 2019 16:50:53 +0200

The current code says:

  next_line_no = line_no + page_incr;
  if (next_line_no < line_no)
    die (EXIT_FAILURE, 0, _("line number overflow"));

Since intmax_t is a regular integer type, overflow invokes undefined
behavior and must therefore be checked using other means.
This bug report was last modified 5 years and 226 days ago.

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