Bluetooth: hci_sock: Fix not validating setsockopt user input

Check user input length before copying data.

Fixes: 09572fca7223 ("Bluetooth: hci_sock: Add support for BT_{SND,RCV}BUF")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 4ee1b97..703b84b 100644 (file)
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1946,10 +1946,9 @@ static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
 
        switch (optname) {
        case HCI_DATA_DIR:
-               if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
-                       err = -EFAULT;
+               err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, len);
+               if (err)
                        break;
-               }
 
                if (opt)
                        hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
@@ -1958,10 +1957,9 @@ static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
                break;
 
        case HCI_TIME_STAMP:
-               if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
-                       err = -EFAULT;
+               err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, len);
+               if (err)
                        break;
-               }
 
                if (opt)
                        hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
@@ -1979,11 +1977,9 @@ static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
                        uf.event_mask[1] = *((u32 *) f->event_mask + 1);
                }
 
-               len = min_t(unsigned int, len, sizeof(uf));
-               if (copy_from_sockptr(&uf, optval, len)) {
-                       err = -EFAULT;
+               err = bt_copy_from_sockptr(&uf, sizeof(uf), optval, len);
+               if (err)
                        break;
-               }
 
                if (!capable(CAP_NET_RAW)) {
                        uf.type_mask &= hci_sec_filter.type_mask;
@@ -2042,10 +2038,9 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
                        goto done;
                }
 
-               if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
-                       err = -EFAULT;
+               err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, len);
+               if (err)
                        break;
-               }
 
                hci_pi(sk)->mtu = opt;
                break;