GNU bug report logs - #7993
cut segmentation fault with unbounded ranges

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Package: coreutils;

Reported by: Paul Marinescu <paul.marinescu <at> imperial.ac.uk>

Date: Sun, 6 Feb 2011 18:27:02 UTC

Severity: normal

Done: Jim Meyering <jim <at> meyering.net>

Bug is archived. No further changes may be made.

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From: Paul Marinescu <paul.marinescu <at> imperial.ac.uk>
To: 7993 <at> debbugs.gnu.org
Subject: bug#7993: cut segmentation fault with unbounded ranges
Date: Sun, 06 Feb 2011 18:20:11 +0000

In coreutils 8.9 (latest), the following commands trigger an invalid
memory access.

cut -c1234567890- --output-d=: foo
cut -f1234567890- --output-d=: foo
cut -b1234567890- --output-d=: foo

The number 1234567890 is just a random number 'big enough' to make the
invalid access generate a segmentation fault but the invalid access
happens for values as low as 8 (valgrind)

The problem is that ranges going to end of line (i.e., 'x-') are not
taken into account when calculating the size of the printable_field
vector, but their lower bound is used as an index on line 525:

  if (output_delimiter_specified
      && !complement
      && eol_range_start && !is_printable_field (eol_range_start))


Paul
This bug report was last modified 14 years and 109 days ago.

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