diff options
| author | Takamori Yamaguchi <takamori.yamaguchi@jp.sony.com> | 2012-11-08 15:53:39 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-11-16 16:47:13 +0000 |
| commit | 3f2a7f33cab017aaf692a499439b8cd6b8998c7f (patch) | |
| tree | 837f68d84ed595d8866ba4fe9934864ae903ad69 | |
| parent | ca6072f097be890dc39ad6423522ab7bda42d0b7 (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: Ben Hutchings <ben@decadent.org.uk>
| -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 86eb848259a9..313381cc88ac 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3015,6 +3015,8 @@ static int kswapd(void *p) &balanced_classzone_idx); } } + + current->reclaim_state = NULL; return 0; } |