Bug 300195 (CVE-2009-4307)

Summary:	Kernel: ext4 ext4_fill_flex_info() DoS (CVE-2009-4307)
Product:	Gentoo Security	Reporter:	Alex Legler (RETIRED) <a3li>
Component:	Kernel	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=503358ae01b70ce6909d19dd01287093f6b6271c
Whiteboard:	[linux <2.6.31.8] [gp <2.6.31-9]
Package list:		Runtime testing required:	---

Description Alex Legler (RETIRED) archtester

2010-01-08 17:20:31 UTC

CVE-2009-4307 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2009-4307):
  The ext4_fill_flex_info function in fs/ext4/super.c in the Linux
  kernel before 2.6.32-git6 allows user-assisted remote attackers to
  cause a denial of service (divide-by-zero error and panic) via a
  malformed ext4 filesystem containing a super block with a large
  FLEX_BG group size (aka s_log_groups_per_flex value).