The patch titled
Subject: mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()
has been added to the -mm tree. Its filename is
mm-bugfix-set-current-reclaim_state-to-null-while-returning-from-kswapd.patch
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------------------------------------------------------
From: Takamori Yamaguchi <takamori.yamaguchi@xxxxxxxxxxx>
Subject: mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()
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 off lining,
__free_slab() can access dangling pointer of current->reclaim_state.
Signed-off-by: Takamori Yamaguchi <takamori.yamaguchi@xxxxxxxxxxx>
Signed-off-by: Aaditya Kumar <aaditya.kumar@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/vmscan.c~mm-bugfix-set-current-reclaim_state-to-null-while-returning-from-kswapd mm/vmscan.c
--- a/mm/vmscan.c~mm-bugfix-set-current-reclaim_state-to-null-while-returning-from-kswapd
+++ a/mm/vmscan.c
@@ -3034,6 +3034,8 @@ static int kswapd(void *p)
&balanced_classzone_idx);
}
}
+
+ current->reclaim_state = NULL;
return 0;
}
_
Patches currently in -mm which might be from takamori.yamaguchi@xxxxxxxxxxx are
mm-bugfix-set-current-reclaim_state-to-null-while-returning-from-kswapd.patch
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