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| author | Johannes Weiner <hannes@cmpxchg.org> | 2009-04-30 15:08:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-05-02 15:36:09 -0700 |
| commit | bc43f75cd9815833b27831600ccade672edb5e43 (patch) | |
| tree | 87ded2ff291b63259ac3df846a09d8348174f636 /mm | |
| parent | 53951bd57dfe2da58f86cdf276719082d80d8485 (diff) | |
| download | lwn-bc43f75cd9815833b27831600ccade672edb5e43.tar.gz lwn-bc43f75cd9815833b27831600ccade672edb5e43.zip | |
mm: fix pageref leak in do_swap_page()
By the time the memory cgroup code is notified about a swapin we
already hold a reference on the fault page.
If the cgroup callback fails make sure to unlock AND release the page
reference which was taken by lookup_swap_cach(), or we leak the reference.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c index cf6873e91c6a..6a4ef0fd0711 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2458,8 +2458,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, if (mem_cgroup_try_charge_swapin(mm, page, GFP_KERNEL, &ptr)) { ret = VM_FAULT_OOM; - unlock_page(page); - goto out; + goto out_page; } /* @@ -2521,6 +2520,7 @@ out: out_nomap: mem_cgroup_cancel_charge_swapin(ptr); pte_unmap_unlock(page_table, ptl); +out_page: unlock_page(page); page_cache_release(page); return ret; |