ACK: [SRU][X][CVE-2020-12352][PATCH v2 1/1] Bluetooth: A2MP: Fix not initializing all members

[Kleber Souza]

On 22.10.20 17:48, William Breathitt Gray wrote:
> From: Luiz Augusto von Dentz <luiz.von.dentz at intel.com>
> 
> This fixes various places where a stack variable is used uninitialized.
> 
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz at intel.com>
> Signed-off-by: Marcel Holtmann <marcel at holtmann.org>
> 
> CVE-2020-12352
> 
> (cherry picked from commit eddb7732119d53400f48a02536a84c509692faa8)
> Signed-off-by: William Breathitt Gray <william.gray at canonical.com>

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>

> ---
>  net/bluetooth/a2mp.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
> index 5f123c3320a7..8f918155685d 100644
> --- a/net/bluetooth/a2mp.c
> +++ b/net/bluetooth/a2mp.c
> @@ -233,6 +233,9 @@ static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
>  			struct a2mp_info_req req;
>  
>  			found = true;
> +
> +			memset(&req, 0, sizeof(req));
> +
>  			req.id = cl->id;
>  			a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
>  				  sizeof(req), &req);
> @@ -312,6 +315,8 @@ static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
>  	if (!hdev || hdev->dev_type != HCI_AMP) {
>  		struct a2mp_info_rsp rsp;
>  
> +		memset(&rsp, 0, sizeof(rsp));
> +
>  		rsp.id = req->id;
>  		rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
>  
> @@ -355,6 +360,8 @@ static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
>  	if (!ctrl)
>  		return -ENOMEM;
>  
> +	memset(&req, 0, sizeof(req));
> +
>  	req.id = rsp->id;
>  	a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
>  		  &req);
> @@ -383,6 +390,8 @@ static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
>  		struct a2mp_amp_assoc_rsp rsp;
>  		rsp.id = req->id;
>  
> +		memset(&rsp, 0, sizeof(rsp));
> +
>  		if (tmp) {
>  			rsp.status = A2MP_STATUS_COLLISION_OCCURED;
>  			amp_mgr_put(tmp);
> @@ -471,7 +480,6 @@ static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
>  				   struct a2mp_cmd *hdr)
>  {
>  	struct a2mp_physlink_req *req = (void *) skb->data;
> -
>  	struct a2mp_physlink_rsp rsp;
>  	struct hci_dev *hdev;
>  	struct hci_conn *hcon;
> @@ -482,6 +490,8 @@ static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
>  
>  	BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
>  
> +	memset(&rsp, 0, sizeof(rsp));
> +
>  	rsp.local_id = req->remote_id;
>  	rsp.remote_id = req->local_id;
>  
> @@ -560,6 +570,8 @@ static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
>  
>  	BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
>  
> +	memset(&rsp, 0, sizeof(rsp));
> +
>  	rsp.local_id = req->remote_id;
>  	rsp.remote_id = req->local_id;
>  	rsp.status = A2MP_STATUS_SUCCESS;
> @@ -682,6 +694,8 @@ static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
>  	if (err) {
>  		struct a2mp_cmd_rej rej;
>  
> +		memset(&rej, 0, sizeof(rej));
> +
>  		rej.reason = cpu_to_le16(0);
>  		hdr = (void *) skb->data;
>  
> @@ -905,6 +919,8 @@ void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
>  
>  	BT_DBG("%s mgr %p", hdev->name, mgr);
>  
> +	memset(&rsp, 0, sizeof(rsp));
> +
>  	rsp.id = hdev->id;
>  	rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
>  
> @@ -1002,6 +1018,8 @@ void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
>  	if (!mgr)
>  		return;
>  
> +	memset(&rsp, 0, sizeof(rsp));
> +
>  	hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
>  	if (!hs_hcon) {
>  		rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
> @@ -1034,6 +1052,8 @@ void a2mp_discover_amp(struct l2cap_chan *chan)
>  
>  	mgr->bredr_chan = chan;
>  
> +	memset(&req, 0, sizeof(req));
> +
>  	req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
>  	req.ext_feat = 0;
>  	a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
>