In mm/memcontrol.c::mem_cgroup_move_parent() there's a path that jumps
to the 'put_back' label
ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false, charge);
if (ret || !parent)
goto put_back;
where we'll
if (charge > PAGE_SIZE)
compound_unlock_irqrestore(page, flags);
but, we have not assigned anything to 'flags' at this point, nor have we
called 'compound_lock_irqsave()' (which is what sets 'flags'). The
'put_back' label should be moved below the call to
compound_unlock_irqrestore() as per this patch.
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8dba474f03