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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2007-02-20 13:57:49 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-20 17:10:13 -0800
commit8af5e2eb3cc4450ffba9496c875beac41bf4f4f8 (patch)
treed15c56e8add1b53d5ed4d5dcb5d1f016d8f2b1c9
parentb446b60e4eb5e5457120c4728ada871b1209c1d0 (diff)
downloadlinux-stericsson-8af5e2eb3cc4450ffba9496c875beac41bf4f4f8.tar.gz
[PATCH] fix mempolicy's check on a system with memory-less-node
bind_zonelist() can create zero-length zonelist if there is a memory-less-node. This patch checks the length of zonelist. If length is 0, returns -EINVAL. tested on ia64/NUMA with memory-less-node. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Andi Kleen <ak@suse.de> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mempolicy.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 259a706bd83e..cf2a5381030a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -144,7 +144,7 @@ static struct zonelist *bind_zonelist(nodemask_t *nodes)
max++; /* space for zlcache_ptr (see mmzone.h) */
zl = kmalloc(sizeof(struct zone *) * max, GFP_KERNEL);
if (!zl)
- return NULL;
+ return ERR_PTR(-ENOMEM);
zl->zlcache_ptr = NULL;
num = 0;
/* First put in the highest zones from all nodes, then all the next
@@ -162,6 +162,10 @@ static struct zonelist *bind_zonelist(nodemask_t *nodes)
break;
k--;
}
+ if (num == 0) {
+ kfree(zl);
+ return ERR_PTR(-EINVAL);
+ }
zl->zones[num] = NULL;
return zl;
}
@@ -193,9 +197,10 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
break;
case MPOL_BIND:
policy->v.zonelist = bind_zonelist(nodes);
- if (policy->v.zonelist == NULL) {
+ if (IS_ERR(policy->v.zonelist)) {
+ void *error_code = policy->v.zonelist;
kmem_cache_free(policy_cache, policy);
- return ERR_PTR(-ENOMEM);
+ return error_code;
}
break;
}
@@ -1667,7 +1672,7 @@ void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask)
* then zonelist_policy() will "FALL THROUGH" to MPOL_DEFAULT.
*/
- if (zonelist) {
+ if (!IS_ERR(zonelist)) {
/* Good - got mem - substitute new zonelist */
kfree(pol->v.zonelist);
pol->v.zonelist = zonelist;