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Bug 1337441

Summary: zlib 1.2.7 writing empty files on gzopen()/gzclose()
Product: Red Hat Enterprise Linux 7 Reporter: Victor Luchits <vluchits>
Component: zlibAssignee: Jan Chaloupka <jchaloup>
Status: CLOSED ERRATA QA Contact: qe-baseos-daemons
Severity: high Docs Contact:
Priority: unspecified    
Version: 7.0CC: jscotka
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: zlib-1.2.7-17.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-11-04 03:39:46 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Test program none

Description Victor Luchits 2016-05-19 08:39:23 UTC 
Created attachment 1159301 [details]
Test program

Description of problem:
Calling zlib's gzopen() on write and gzclose() produces an empty file, which is not a valid .gz file.

Please consider backporting the following patch from zlib's official github repository as it currently affects production systems running on CentOS 7: https://github.com/madler/zlib/commit/0cf495a1ca941428c0b11e2307cad760ae44993e

Version-Release number of selected component (if applicable):
1.2.7

How reproducible:
Always

Steps to Reproduce:
1. gcc zlibtest.c -lz -o zlibtest 
2. ./zlibtest
3. md5sum /tmp/gztest.gz

Actual results:
d41d8cd98f00b204e9800998ecf8427e  gztest.gz

Expected results:
7029066c27ac6f5ef18d660d5741979a  gztest.gz

Additional info:
Comment 6 errata-xmlrpc 2016-11-04 03:39:46 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2319.html