tree b54d3d45349fb8a00ce8a086da55a1ebf3394646
parent 42d623a8cd08eb93ab221d22cee5a62618895bbf
author Eric Dumazet <eric.dumazet@gmail.com> 1321974122 +0100
committer Pekka Enberg <penberg@kernel.org> 1322117059 +0200

slub: avoid potential NULL dereference or corruption

show_slab_objects() can trigger NULL dereferences or memory corruption.

Another cpu can change its c->page to NULL or c->node to NUMA_NO_NODE
while we use them.

Use ACCESS_ONCE(c->page) and ACCESS_ONCE(c->node) to make sure this
cannot happen.

Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>