3.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Takamori Yamaguchi <takamori.yamagu...@jp.sony.com>
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.yamagu...@jp.sony.com>
Signed-off-by: Aaditya Kumar <aaditya.ku...@ap.sony.com>
Acked-by: David Rientjes <rient...@google.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
--- 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;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
