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[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>
This commit is contained in:
Stephen Hemminger 2006-08-29 17:06:13 -07:00 committed by David S. Miller
parent 3696f625e2
commit b6fe17d6cc
1 changed files with 5 additions and 1 deletions
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6
net/core/dev.c
View File

@ -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;
}