From: Tao Ma <boyu.mt@taobao.com>
Date: Mon, 4 Apr 2011 20:00:49 +0000 (-0400)
Subject: ext4: fix a double free in ext4_register_li_request
X-Git-Tag: v2.6.39-rc3~2^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=46e4690bbd9a4f8d9e7c4f34e34b48f703ad47e0;p=pandora-kernel.git

ext4: fix a double free in ext4_register_li_request

In ext4_register_li_request, we malloc a ext4_li_request and
inserts it into ext4_li_info->li_request_list. In case of any
error later, we free it in the end.  But if we have some error
in ext4_run_lazyinit_thread, the whole li_request_list will be
dropped and freed in it. So we will double free this ext4_li_request.

This patch just sets elr to NULL after it is inserted to the list
so that the latter kfree won't double free it.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
---

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