[NET]: Disallow whitespace in network device names.

It causes way too much trouble and confusion in userspace.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 5 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 9fe96cde3e19..d4a1ec3bded5 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -116,6 +116,7 @@
 #include <linux/audit.h>
 #include <linux/dmaengine.h>
 #include <linux/err.h>
+#include <linux/ctype.h>
 
 /*
  *      The list of packet types we will receive (as opposed to discard)
@@ -632,14 +633,22 @@ struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mas
  *      @name: name string
  *
  *      Network device names need to be valid file names to
- *      to allow sysfs to work
+ *      to allow sysfs to work.  We also disallow any kind of
+ *      whitespace.
  */
 int dev_valid_name(const char *name)
 {
-        return !(*name == '\0' 
-                 || !strcmp(name, ".")
-                 || !strcmp(name, "..")
-                 || strchr(name, '/'));
+        if (*name == '\0')
+                return 0;
+        if (!strcmp(name, ".") || !strcmp(name, ".."))
+                return 0;
+
+        while (*name) {
+                if (*name == '/' || isspace(*name))
+                        return 0;
+                name++;
+        }
+        return 1;
 }
 
 /**