Bluetooth: Fix possible NULL pointer dereference in cmd_complete

It is now possible to create command complete event without specific
reply data by passing NULL as reply with len 0. Check pointer before
calling memcpy to avoid undefined behaviour.

Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 46c3edc72cd1..34f58f4ad12b 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -92,7 +92,9 @@ static int cmd_complete(struct sock *sk, u16 index, u16 cmd, void *rp,
 
         ev = (void *) skb_put(skb, sizeof(*ev) + rp_len);
         put_unaligned_le16(cmd, &ev->opcode);
-        memcpy(ev->data, rp, rp_len);
+
+        if (rp)
+                memcpy(ev->data, rp, rp_len);
 
         if (sock_queue_rcv_skb(sk, skb) < 0)
                 kfree_skb(skb);