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| author | Takamori Yamaguchi <takamori.yamaguchi@jp.sony.com> | 2012-11-08 15:53:39 -0800 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2013-06-10 11:42:29 +0200 |
| commit | 61daa923b480d1bb6f2340d8bca26b6503723d41 (patch) | |
| tree | 0529b04f93ec8f3d2e746df83fbc5375b5061d48 /mm | |
| parent | 6d9f42bed29dd5e643d392b5e038cb0c12c96678 (diff) | |
| download | lwn-61daa923b480d1bb6f2340d8bca26b6503723d41.tar.gz lwn-61daa923b480d1bb6f2340d8bca26b6503723d41.zip | |
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>
Signed-off-by: Willy Tarreau <w@1wt.eu>
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 4649929401f8..738db2b29e19 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2241,6 +2241,8 @@ static int kswapd(void *p) balance_pgdat(pgdat, order); } } + + current->reclaim_state = NULL; return 0; } |