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| author | Takamori Yamaguchi <takamori.yamaguchi@jp.sony.com> | 2012-11-09 03:53:39 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 23:37:19 +0400 |
| commit | 3f874ecc49208f3635e29c3a08ade01778ad85e4 (patch) | |
| tree | 13a274853bac30e5a564bcc42a26e2ec585bbbd6 /mm | |
| parent | 16286083befef95045f84ecc10f19b1a14fc7283 (diff) | |
| download | linux-3f874ecc49208f3635e29c3a08ade01778ad85e4.tar.xz | |
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')
| -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 e989ee22f100..e6ca5051c021 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3128,6 +3128,8 @@ static int kswapd(void *p) &balanced_classzone_idx); } } + + current->reclaim_state = NULL; return 0; } |