From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 23 Nov 2009 12:24:46 +0000 (-0500)
Subject: ext4: avoid divide by zero when trying to mount a corrupted file system
X-Git-Tag: v2.6.33-rc1~330^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=503358ae01b70ce6909d19dd01287093f6b6271c;p=pandora-kernel.git

ext4: avoid divide by zero when trying to mount a corrupted file system

If s_log_groups_per_flex is greater than 31, then groups_per_flex will
will overflow and cause a divide by zero error.  This can cause kernel
BUG if such a file system is mounted.

Thanks to Nageswara R Sastry for analyzing the failure and providing
an initial patch.

http://bugzilla.kernel.org/show_bug.cgi?id=14287

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
---

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