Bug 567168 (CVE-2010-1085) - CVE-2010-1085 kernel: ALSA: hda-intel: Avoid divide by zero crash
Summary: CVE-2010-1085 kernel: ALSA: hda-intel: Avoid divide by zero crash
Status: CLOSED ERRATA
Alias: CVE-2010-1085
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: reported=20100222,source=lkml,public=...
Keywords: Security
Depends On: 567169 567170 567171 567172 567173
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-02-22 03:48 UTC by Eugene Teo (Security Response)
Modified: 2019-06-08 12:56 UTC (History)
12 users (show)

(edit)
Clone Of:
(edit)
Last Closed: 2012-03-28 08:54:20 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2010:0394 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2010-05-05 13:05:05 UTC
Red Hat Product Errata RHSA-2010:0398 normal SHIPPED_LIVE Important: kernel security and bug fix update 2010-05-06 18:49:33 UTC

Description Eugene Teo (Security Response) 2010-02-22 03:48:24 UTC
Description of problem:
[1.] One line summary of the problem:
hda-intel crashes the kernel due to a divide by zero in azx_position_ok

[2.] Full description of the problem/report:
Using mp3blaster-3.2.5 (latest version) to play MP3 audio, the reporter was able to crash the kernel by stopping and restarting playback using the "5" key repeatedly.  This happens as a normal user, not only as root.  Kernel backtrace points to azx_position_ok() dividing by zero, so he wrote a tiny patch to investigate which reported via printk() values of pos and azx_dev->period_bytes; on crash, both were 0.  The offending operation does: if (pos % azx_dev->period_bytes > azx_dev->period_bytes / 2) which obviously is the source of the crash. This happens on linux 2.6.32.7 as well as linux 2.6.33-rc6.

Upstream commit:
http://git.kernel.org/linus/fed08d036f2aabd8d0c684439de37f8ebec2bbc2

References:
http://lkml.org/lkml/2010/2/6/40
http://nctritech.net/bugreport.txt
http://lwn.net/Articles/375417/

Requested a CVE name for this.

Comment 2 errata-xmlrpc 2010-05-05 13:05:20 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 4

Via RHSA-2010:0394 https://rhn.redhat.com/errata/RHSA-2010-0394.html

Comment 3 errata-xmlrpc 2010-05-06 18:49:44 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2010:0398 https://rhn.redhat.com/errata/RHSA-2010-0398.html


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