[PATCH] Bluetooth: fix potential NULL ptr deref in dtl1_cs.c::dtl1_hci_send_frame()

There's a problem in drivers/bluetooth/dtl1_cs.c::dtl1_hci_send_frame()

If bt_skb_alloc() returns NULL, then skb_reserve(s, NSHL); will cause a
NULL pointer deref - ouch.  If we can't allocate the resources we require
we need to tell the caller by returning -ENOMEM.

Found by the coverity checker as bug #409
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/bluetooth/dtl1_cs.c

@@ -423,6 +423,9 @@ static int dtl1_hci_send_frame(struct sk_buff *skb)
 	nsh.len = skb->len;
 
 	s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
+	if (!s)
+		return -ENOMEM;
+
 	skb_reserve(s, NSHL);
 	memcpy(skb_put(s, skb->len), skb->data, skb->len);
 	if (skb->len & 0x0001)