[PATCH] NET: Ensure device name passed to SO_BINDTODEVICE is NULL terminated.
The user can pass us arbitrary garbage so we should ensure the
string they give us is null terminated before we pass it on
to dev_get_by_index() et al.
Found by Solar Designer.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/net/core/sock.c b/net/core/sock.c
index 13cc3be..2a3e235 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -403,8 +403,9 @@
if (!valbool) {
sk->sk_bound_dev_if = 0;
} else {
- if (optlen > IFNAMSIZ)
- optlen = IFNAMSIZ;
+ if (optlen > IFNAMSIZ - 1)
+ optlen = IFNAMSIZ - 1;
+ memset(devname, 0, sizeof(devname));
if (copy_from_user(devname, optval, optlen)) {
ret = -EFAULT;
break;
