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path: root/drivers/block/nbd.c
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Diffstat (limited to 'drivers/block/nbd.c')
-rw-r--r--drivers/block/nbd.c24
1 files changed, 12 insertions, 12 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 5a1f98494ddd..b3cdfc0ffb98 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1800,17 +1800,6 @@ static struct nbd_device *nbd_dev_add(int index, unsigned int refs)
refcount_set(&nbd->refs, 0);
INIT_LIST_HEAD(&nbd->list);
disk->major = NBD_MAJOR;
-
- /* Too big first_minor can cause duplicate creation of
- * sysfs files/links, since index << part_shift might overflow, or
- * MKDEV() expect that the max bits of first_minor is 20.
- */
- disk->first_minor = index << part_shift;
- if (disk->first_minor < index || disk->first_minor > MINORMASK) {
- err = -EINVAL;
- goto out_free_work;
- }
-
disk->minors = 1 << part_shift;
disk->fops = &nbd_fops;
disk->private_data = nbd;
@@ -1915,8 +1904,19 @@ static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info)
if (!netlink_capable(skb, CAP_SYS_ADMIN))
return -EPERM;
- if (info->attrs[NBD_ATTR_INDEX])
+ if (info->attrs[NBD_ATTR_INDEX]) {
index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]);
+
+ /*
+ * Too big first_minor can cause duplicate creation of
+ * sysfs files/links, since index << part_shift might overflow, or
+ * MKDEV() expect that the max bits of first_minor is 20.
+ */
+ if (index < 0 || index > MINORMASK >> part_shift) {
+ printk(KERN_ERR "nbd: illegal input index %d\n", index);
+ return -EINVAL;
+ }
+ }
if (!info->attrs[NBD_ATTR_SOCKETS]) {
printk(KERN_ERR "nbd: must specify at least one socket\n");
return -EINVAL;