[Bug 1521043] Re: less 458 crashes if search regex has many groups

[Michael Terry]

Thank you so much for the patch!  I've uploaded it with minor
modifications to xenial.  Specifically, adjusted changelog (version
simplification, wily->xenial, named patch file) and ran update-
maintainer.

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https://bugs.launchpad.net/bugs/1521043

Title:
  less 458 crashes if search regex has many groups

Status in less package in Ubuntu:
  Triaged
Status in less package in Debian:
  Incomplete

Bug description:
  less 458 crashes if there are enough capture groups in the regular
  expression used for search:

      newline=$(printf \\nx); newline=${newline%x}
      echo x | LESS="+g/(((((x)))))${newline}" less

  On amd64, the above produces a segfault:

      Segmentation fault (core dumped)

  On i386, the above triggers an assert:

      *** Error in `less': double free or corruption (fasttop): 0x0887f9e8 ***
      Aborted

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