[NET] netdev: Check name length

Some improvements to robust name interface.  These API's are safe
now by convention, but it is worth providing some safety checks
against future bugs.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index fc82f6f6e1c..14de297d024 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -640,6 +640,8 @@ int dev_valid_name(const char *name)
 {
         if (*name == '\0')
                 return 0;
+        if (strlen(name) >= IFNAMSIZ)
+                return 0;
         if (!strcmp(name, ".") || !strcmp(name, ".."))
                 return 0;
 
@@ -3191,13 +3193,15 @@ struct net_device *alloc_netdev(int sizeof_priv, const char *name,
         struct net_device *dev;
         int alloc_size;
 
+        BUG_ON(strlen(name) >= sizeof(dev->name));
+
         /* ensure 32-byte alignment of both the device and private area */
         alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
         alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
 
         p = kzalloc(alloc_size, GFP_KERNEL);
         if (!p) {
-                printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
+                printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
                 return NULL;
         }