oss-security - CVE request: kernel: NULL pointer dereference in sg_build

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <4A9FEA2F.8080501@redhat.com>
Date: Fri, 04 Sep 2009 00:09:19 +0800
From: Eugene Teo <eugene@...hat.com>
To: oss-security@...ts.openwall.com
CC: "Steven M. Christey" <coley@...us.mitre.org>
Subject: CVE request: kernel: NULL pointer dereference in sg_build_indirect()

Backtrace:
http://lkml.org/lkml/2009/9/3/1

Upstream proposed patch:
http://lkml.org/lkml/2009/9/3/107

Triggered by firing up "xcdroast" to duplicate a CD.

[...]
  out:
  	for (i = 0; i < k; i++)
-		__free_pages(schp->pages[k], order);
+		__free_pages(schp->pages[i], order);

When the allocation in sg_build_indirect() fails, an oops can occur 
because of an obvious typo.

This was introduced by upstream commit 10db10d1 in v2.6.28-rc1.

Thanks, Eugene

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.