Bug 668976 – a test unit ready causes a panic on 5.6 (CCISS driver) [rhel-5.6.z]

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Bug 668976 - a test unit ready causes a panic on 5.6 (CCISS driver) [rhel-5.6.z]

Summary:	a test unit ready causes a panic on 5.6 (CCISS driver) [rhel-5.6.z]

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	5.6
Hardware:	Unspecified Linux

Priority	urgent Severity urgent
Target Milestone:	rc
Target Release:	---
Assigned To:	Jiri Pirko
QA Contact:	Red Hat Kernel QE team
Docs Contact:

URL:
Whiteboard:
Keywords:	Regression, ZStream

Depends On:	664592
Blocks:
	Show dependency tree / graph

Reported:	2011-01-12 05:12 EST by RHEL Product and Program Management
Modified:	2015-05-04 21:22 EDT (History)
CC List:	12 users (show)

See Also:
Fixed In Version:	kernel-2.6.18-238.2.1.el5
Doc Type:	Bug Fix
Doc Text:	Using the cciss driver, when a TUR (Test Unit Ready) was executed, the rq->bio pointer in the blk_rq_bytes function was of value null, which resulted in a null pointer dereference, and, consequently, kernel panic occurred. With this update, the rq->bio pointer is used only when the blk_fs_request(rq) condition is true, thus, kernel panic no longer occurs.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-03-01 15:30:35 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0303	normal	SHIPPED_LIVE	Moderate: kernel security and bug fix update	2011-03-01 15:29:26 EST

Groups: None (edit)

Description RHEL Product and Program Management 2011-01-12 05:12:46 EST

This bug has been copied from bug #664592 and has been proposed
to be backported to 5.6 z-stream (EUS).

Comment 3 Jiri Pirko 2011-01-21 07:28:56 EST

in kernel-2.6.18-238.2.1.el5

linux-2.6-block-cciss-fix-null-pointer-problem-in-tur-usage.patch

Comment 6 errata-xmlrpc 2011-03-01 15:30:35 EST

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0303.html

Comment 7 Martin Prpič 2011-07-13 16:20:13 EDT

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Using the cciss driver, when a TUR (Test Unit Ready) was executed, the rq->bio pointer in the blk_rq_bytes function was of value null, which resulted in a null pointer dereference, and, consequently, kernel panic occurred. With this update, the rq->bio pointer is used only when the blk_fs_request(rq) condition is true, thus, kernel panic no longer occurs.

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