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Bug 1249191

Summary:	trace-cmd record crashes if -f is used before -e
Product:	Red Hat Enterprise Linux 7	Reporter:	Daniel Bristot de Oliveira <daolivei>
Component:	trace-cmd	Assignee:	John Kacur <jkacur>
Status:	CLOSED ERRATA	QA Contact:	Ziqian SUN (Zamir) <zsun>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	bhu, jkacur, jkastner, lilu, williams
Target Milestone:	rc	Keywords:	Reopened
Target Release:	7.3
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:
Clones:	1249194 (view as bug list)		Environment:
Last Closed:	2016-11-04 08:07:24 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:
Bug Depends On:
Bug Blocks:	1249194, 1274397, 1282960, 1313485

Description Daniel Bristot de Oliveira 2015-07-31 18:57:57 UTC

Description of problem:
The trace-cmd record command is crashing if a -f filter is used before
a -e event.

The usage a -f before a -e is a command line error, and trace-cmd
record detects this error by checking if the last_event pointer is NULL.

However, the last_event is not initialized as NULL and this command line
error is not detected. Then, the last_event is used to save the filter
options and this causes a segmentation fault because last_event was not
initialized yet.

Version-Release number of selected component (if applicable):
trace-cmd-2.2.1-6.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. # trace-cmd record -f foo

Actual results:
  # trace-cmd record -f foo
  Segmentation fault

Expected results:
  # trace-cmd record -f foo
  filter must come after event

Additional info:
  upstream patch proposed: https://lkml.org/lkml/2015/7/20/482

Comment 3 John Kacur 2015-11-18 00:01:53 UTC

Tested-by: John Kacur <jkacur> sent upstream, will apply here.

Comment 11 errata-xmlrpc 2016-11-04 08:07:24 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-2016-2531.html