From: Li Zefan <lizefan@huawei.com>
Date: Tue, 12 Mar 2013 22:36:00 +0000 (-0700)
Subject: cgroup: fix an off-by-one bug which may trigger BUG_ON()
X-Git-Tag: v3.2.45~110
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f596ca6c42fc4a8bb8269684ad2b839d78f684eb;p=pandora-kernel.git

cgroup: fix an off-by-one bug which may trigger BUG_ON()

commit 3ac1707a13a3da9cfc8f242a15b2fae6df2c5f88 upstream.

The 3rd parameter of flex_array_prealloc() is the number of elements,
not the index of the last element.

The effect of the bug is, when opening cgroup.procs, a flex array will
be allocated and all elements of the array is allocated with
GFP_KERNEL flag, but the last one is GFP_ATOMIC, and if we fail to
allocate memory for it, it'll trigger a BUG_ON().

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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