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    Subject[06/44] numa: fix slab_node(MPOL_BIND)
    2.6.27-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Eric Dumazet <eric.dumazet@gmail.com>

    commit 800416f799e0723635ac2d720ad4449917a1481c upstream.

    When a node contains only HighMem memory, slab_node(MPOL_BIND)
    dereferences a NULL pointer.

    [ This code seems to go back all the way to commit 19770b32609b: "mm:
    filter based on a nodemask as well as a gfp_mask". Which was back in
    April 2008, and it got merged into 2.6.26. - Linus ]

    Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
    Cc: Mel Gorman <mel@csn.ul.ie>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    mm/mempolicy.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/mm/mempolicy.c
    +++ b/mm/mempolicy.c
    @@ -1404,7 +1404,7 @@ unsigned slab_node(struct mempolicy *pol
    (void)first_zones_zonelist(zonelist, highest_zoneidx,
    &policy->v.nodes,
    &zone);
    - return zone->node;
    + return zone ? zone->node : numa_node_id();
    }

    default:



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