[PATCH] fix mempolicy's check on a system with memory-less-node

8af5e2eb · KAMEZAWA Hiroyuki <[email protected]> · 2007-02-20 13:57:49 -08:00

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 <[email protected]>
Acked-by: Andi Kleen <[email protected]>
Cc: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 8af5e2eb3cc4450ffba9496c875beac41bf4f4f8
Parents: b446b60e

Changes

1 files changed · +9 −4

File	Status	Add	Del	Content
mm/mempolicy.c	modified	+9	−4	View file

mm/mempolicy.c

View file

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 259a706..cf2a538 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;