X25: Dont let x25_bind use addresses containing characters

Addresses should be all digits.
Stops x25_bind using addresses containing characters.

Signed-off-by: Andrew Hendry <andrew.hendry@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 1 deletions

diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 6c7104edec60..9796f3ed1edb 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -55,6 +55,7 @@
 #include <linux/notifier.h>
 #include <linux/init.h>
 #include <linux/compat.h>
+#include <linux/ctype.h>
 
 #include <net/x25.h>
 #include <net/compat.h>
@@ -648,7 +649,7 @@ static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 {
         struct sock *sk = sock->sk;
         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
-        int rc = 0;
+        int len, i, rc = 0;
 
         lock_kernel();
         if (!sock_flag(sk, SOCK_ZAPPED) ||
@@ -658,6 +659,14 @@ static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                 goto out;
         }
 
+        len = strlen(addr->sx25_addr.x25_addr);
+        for (i = 0; i < len; i++) {
+                if (!isdigit(addr->sx25_addr.x25_addr[i])) {
+                        rc = -EINVAL;
+                        goto out;
+                }
+        }
+
         x25_sk(sk)->source_addr = addr->sx25_addr;
         x25_insert_socket(sk);
         sock_reset_flag(sk, SOCK_ZAPPED);