Bluetooth: Restrict BNEP flags to only valid ones

The BNEP flags should be clearly restricted to valid ones. So this puts
extra checks in place to ensure this.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index 05f57e491ccb..c05eccc1cf82 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -525,6 +525,7 @@ static struct device_type bnep_type = {
 
 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 {
+        u32 valid_flags = 0;
         struct net_device *dev;
         struct bnep_session *s, *ss;
         u8 dst[ETH_ALEN], src[ETH_ALEN];
@@ -535,6 +536,9 @@ int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
         if (!l2cap_is_socket(sock))
                 return -EBADFD;
 
+        if (req->flags & ~valid_flags)
+                return -EINVAL;
+
         baswap((void *) dst, &l2cap_pi(sock->sk)->chan->dst);
         baswap((void *) src, &l2cap_pi(sock->sk)->chan->src);
 
@@ -611,11 +615,15 @@ failed:
 
 int bnep_del_connection(struct bnep_conndel_req *req)
 {
+        u32 valid_flags = 0;
         struct bnep_session *s;
         int  err = 0;
 
         BT_DBG("");
 
+        if (req->flags & ~valid_flags)
+                return -EINVAL;
+
         down_read(&bnep_session_sem);
 
         s = __bnep_get_session(req->dst);
@@ -631,10 +639,12 @@ int bnep_del_connection(struct bnep_conndel_req *req)
 
 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
 {
+        u32 valid_flags = 0;
+
         memset(ci, 0, sizeof(*ci));
         memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
         strcpy(ci->device, s->dev->name);
-        ci->flags = s->flags;
+        ci->flags = s->flags & valid_flags;
         ci->state = s->state;
         ci->role  = s->role;
 }