diff options
author | Takamori Yamaguchi <takamori.yamaguchi@jp.sony.com> | 2012-11-08 15:53:39 -0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 12:14:04 -0800 |
commit | 9e9dbb97a010f748114404bd44ab2e02082d215c (patch) | |
tree | a42ffea6c03fc7d07763be96bf26915c4834a276 /mm/vmscan.c | |
parent | 9f3dc4baa6813f64f89ce408dc93bdcba38ba022 (diff) |
mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()
commit b0a8cc58e6b9aaae3045752059e5e6260c0b94bc upstream.
In kswapd(), set current->reclaim_state to NULL before returning, as
current->reclaim_state holds reference to variable on kswapd()'s stack.
In rare cases, while returning from kswapd() during memory offlining,
__free_slab() and freepages() can access the dangling pointer of
current->reclaim_state.
Signed-off-by: Takamori Yamaguchi <takamori.yamaguchi@jp.sony.com>
Signed-off-by: Aaditya Kumar <aaditya.kumar@ap.sony.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r-- | mm/vmscan.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 99b434b674c0..a018dfcbb2f7 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2953,6 +2953,8 @@ static int kswapd(void *p) &balanced_classzone_idx); } } + + current->reclaim_state = NULL; return 0; } |