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mm/memcontrol.c: fix uninitialized variable use in mem_cgroup_move_parent() 

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>
This commit is contained in:
Jesper Juhl 2011-01-25 15:07:24 -08:00 committed by Linus Torvalds
parent 2ff754fa8f
commit 8dba474f03
1 changed files with 2 additions and 1 deletions
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3
mm/memcontrol.c
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@ -2292,9 +2292,10 @@ static int mem_cgroup_move_parent(struct page_cgroup *pc,
ret = mem_cgroup_move_account(pc, child, parent, true, charge);
if (ret)
mem_cgroup_cancel_charge(parent, charge);
put_back:
if (charge > PAGE_SIZE)
compound_unlock_irqrestore(page, flags);
put_back:
putback_lru_page(page);
put:
put_page(page);