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memcg: NULL pointer dereference at rmdir on some NUMA systems

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N_POSSIBLE doesn't means there is memory...and force_empty can
visit invalid node which have no pgdat.

To visit all valid nodes, N_HIGH_MEMORY should be used.

Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-01-29 14:25:17 -08:00 committed by Linus Torvalds
parent 248ae0d43f
commit 299b4eaa30
1 changed files with 1 additions and 1 deletions
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2
mm/memcontrol.c
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@ -1685,7 +1685,7 @@ static int mem_cgroup_force_empty(struct mem_cgroup *mem, bool free_all)
/* This is for making all *used* pages to be on LRU. */
lru_add_drain_all();
ret = 0;
for_each_node_state(node, N_POSSIBLE) {
for_each_node_state(node, N_HIGH_MEMORY) {
for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) {
enum lru_list l;
for_each_lru(l) {