Bug 1337441 – zlib 1.2.7 writing empty files on gzopen()/gzclose()

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Bug 1337441 - zlib 1.2.7 writing empty files on gzopen()/gzclose()

Summary:	zlib 1.2.7 writing empty files on gzopen()/gzclose()

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	zlib (Show other bugs)
Sub Component:
Version:	7.0
Hardware:	All Linux

Priority	unspecified Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Jan Chaloupka
QA Contact:	qe-baseos-daemons
Docs Contact:

URL:
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Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2016-05-19 04:39 EDT by Victor Luchits
Modified:	2016-11-03 23:39 EDT (History)
CC List:	1 user (show)

See Also:
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:	2016-11-03 23:39:46 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
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Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Attachments	(Terms of Use)
Test program (96 bytes, text/x-csrc) 2016-05-19 04:39 EDT, Victor Luchits	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
CentOS	0010876	None	None	None	2016-05-19 09:49 EDT
Red Hat Product Errata	RHBA-2016:2319	normal	SHIPPED_LIVE	zlib bug fix update	2016-11-03 09:42:48 EDT

Groups: None (edit)

Description Victor Luchits 2016-05-19 04:39:23 EDT

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 2016-11-03 23:39:46 EDT

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

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