Bug 158506

Summary: grep segfaults when all of color, context, match, ignorecase set
Product: [Fedora] Fedora Reporter: Doug Maxey <dwm>
Component: grepAssignee: Tim Waugh <twaugh>
Status: CLOSED UPSTREAM QA Contact: Mike McLean <mikem>
Severity: medium Docs Contact:
Priority: medium    
Version: 3   
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Hardware: All   
OS: Linux   
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Last Closed: 2005-05-23 17:01:35 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
patch to test return from memchr() none

Description Doug Maxey 2005-05-23 04:20:00 UTC 
Description of problem:
When using the command 
grep --color=auto --ignore-case --before-context 1 --after-context=4 --max-count
10 SEARCH-ARG FILE
a segfault is produced in for the _last_ match in search.c

Version-Release number of selected component (if applicable):
grep-2.5.1-31.4

How reproducible:
100%

Actual results:
grep segfaults.

Expected results:
colorized context printed up to match times.

Additional info:
The faulting function is src/search.c::EGexecute::memchr().  The starting
address "beg" is passed as 1.  This was caused by the NULL return from the
previous call to memchr() and the loop continues.
Comment 1 Doug Maxey 2005-05-23 04:20:00 UTC 
Created attachment 114697 [details]
patch to test return from memchr()
Comment 2 Tim Waugh 2005-05-23 12:38:52 UTC 
Thanks.

Complete test case:

(echo foo ; echo foo) | \
  grep --color=auto --ignore-case --before-context=1 \
       --after-context=4 --max-count=1 foo
Comment 3 Doug Maxey 2005-05-23 13:13:57 UTC 
*** Bug 158536 has been marked as a duplicate of this bug. ***
Comment 4 Tim Waugh 2005-05-23 17:01:35 UTC 
Submitted upstream, as this check is missing in unpatched 2.5.1a.

https://savannah.gnu.org/bugs/index.php?func=detailitem&item_id=13161