From 8020c16a6c9fc8d6a5217be8d005f2fc558f6ab5 Mon Sep 17 00:00:00 2001 From: Szymon Janc Date: Mon, 28 Feb 2011 14:09:50 +0100 Subject: [PATCH] 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 Signed-off-by: Gustavo F. Padovan --- net/bluetooth/mgmt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) 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); -- 2.39.5