Bluetooth: Restrict application of socket options

The new socket options should only be evaluated for SOL_BLUETOOTH level
and not for every other level. Previously this causes some minor issues
when detecting if a kernel with certain features is available.

Also restrict BT_SECURITY to SOCK_SEQPACKET for L2CAP and SOCK_STREAM for
the RFCOMM protocol.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index b2d279c245cf..82a9e692baed 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1248,10 +1248,18 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, ch
         if (level == SOL_L2CAP)
                 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
 
+        if (level != SOL_BLUETOOTH)
+                return -ENOPROTOOPT;
+
         lock_sock(sk);
 
         switch (optname) {
         case BT_SECURITY:
+                if (sk->sk_type != SOCK_SEQPACKET) {
+                        err = -EINVAL;
+                        break;
+                }
+
                 sec.level = BT_SECURITY_LOW;
 
                 len = min_t(unsigned int, sizeof(sec), optlen);
@@ -1384,6 +1392,9 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, ch
         if (level == SOL_L2CAP)
                 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
 
+        if (level != SOL_BLUETOOTH)
+                return -ENOPROTOOPT;
+
         if (get_user(len, optlen))
                 return -EFAULT;
 
@@ -1391,6 +1402,11 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, ch
 
         switch (optname) {
         case BT_SECURITY:
+                if (sk->sk_type != SOCK_SEQPACKET) {
+                        err = -EINVAL;
+                        break;
+                }
+
                 sec.level = l2cap_pi(sk)->sec_level;
 
                 len = min_t(unsigned int, len, sizeof(sec));