From: Mingming Cao <cmm@us.ibm.com>
Date: Sun, 25 Jun 2006 12:47:50 +0000 (-0700)
Subject: [PATCH] Avoid disk sector_t overflow for >2TB ext3 filesystem
X-Git-Tag: v2.6.18-rc1~988
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcd5df35882b128ef3e160fab3074e6fe7ae501b;p=pandora-kernel.git

[PATCH] Avoid disk sector_t overflow for >2TB ext3 filesystem

If ext3 filesystem is larger than 2TB, and sector_t is a u32 (i.e.
CONFIG_LBD not defined in the kernel), the calculation of the disk sector
will overflow.  Add check at ext3_fill_super() and ext3_group_extend() to
prevent mount/remount/resize >2TB ext3 filesystem if sector_t size is 4
bytes.

Verified this patch on a 32 bit platform without CONFIG_LBD defined
(sector_t is 32 bits long), mount refuse to mount a 10TB ext3.

Signed-off-by: Mingming Cao<cmm@us.ibm.com>
Acked-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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