Bluetooth: smp: Fix possible NULL dereference

smp_chan_create might return NULL so we need to check before
dereferencing smp.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 16ef0dc..901a616 100644 (file)
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -579,8 +579,11 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
 
        if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags))
                smp = smp_chan_create(conn);
+       else
+               smp = conn->smp_chan;
 
-       smp = conn->smp_chan;
+       if (!smp)
+               return SMP_UNSPECIFIED;
 
        smp->preq[0] = SMP_CMD_PAIRING_REQ;
        memcpy(&smp->preq[1], req, sizeof(*req));