xen-gntdev: integer overflow in gntdev_alloc_map()

The multiplications here can overflow resulting in smaller buffer
sizes than expected.  "count" comes from a copy_from_user().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 3987132..afca14d 100644 (file)
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -114,11 +114,11 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
        if (NULL == add)
                return NULL;
 
-       add->grants    = kzalloc(sizeof(add->grants[0])    * count, GFP_KERNEL);
-       add->map_ops   = kzalloc(sizeof(add->map_ops[0])   * count, GFP_KERNEL);
-       add->unmap_ops = kzalloc(sizeof(add->unmap_ops[0]) * count, GFP_KERNEL);
-       add->kmap_ops  = kzalloc(sizeof(add->kmap_ops[0])  * count, GFP_KERNEL);
-       add->pages     = kzalloc(sizeof(add->pages[0])     * count, GFP_KERNEL);
+       add->grants    = kcalloc(count, sizeof(add->grants[0]), GFP_KERNEL);
+       add->map_ops   = kcalloc(count, sizeof(add->map_ops[0]), GFP_KERNEL);
+       add->unmap_ops = kcalloc(count, sizeof(add->unmap_ops[0]), GFP_KERNEL);
+       add->kmap_ops  = kcalloc(count, sizeof(add->kmap_ops[0]), GFP_KERNEL);
+       add->pages     = kcalloc(count, sizeof(add->pages[0]), GFP_KERNEL);
        if (NULL == add->grants    ||
            NULL == add->map_ops   ||
            NULL == add->unmap_ops ||