This bug was fixed in the package less - 458-3ubuntu1
---------------
less (458-3ubuntu1) xenial; urgency=medium
* d/p/03-707824-fix_double_free_with_multiple_regex_groups.patch:
- Cherry-pick upstream fix for double free in regular expression
code. (Closes: #707824; LP: #1521043)
-- Richard Hansen <[email protected]> Sun, 29 Nov 2015 22:40:34
-0500
** Changed in: less (Ubuntu)
Status: Triaged => Fix Released
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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:
Fix Released
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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