From: Tao Ma <boyu.mt@taobao.com>
Date: Mon, 11 Jul 2011 22:42:42 +0000 (-0400)
Subject: ext4: Fix a double free of sbi->s_group_info in ext4_mb_init_backend
X-Git-Tag: v3.1-rc1~90^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=caaf7a29d31da21bb8d8200d5e42d1c93d3c6e00;p=pandora-kernel.git

ext4: Fix a double free of sbi->s_group_info in ext4_mb_init_backend

If we meet with an error in ext4_mb_add_groupinfo, we kfree
sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)], but fail to
reset it to NULL. So the caller ext4_mb_init_backend will try to kfree
it again and causes a double free. So fix it by resetting it to NULL.

Some typo in comments of mballoc.c are also changed.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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