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Bluetooth: HCI: Use skb_pull_data to parse LE Direct Advertising Report event

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This uses skb_pull_data to check the LE Direct Advertising Report
events received have the minimum required length.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Luiz Augusto von Dentz 2021-12-01 10:55:02 -08:00 committed by Marcel Holtmann
parent b48b833f9e
commit a3679649a1
2 changed files with 25 additions and 8 deletions
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7
include/net/bluetooth/hci.h
View File

@ -2500,7 +2500,7 @@ struct hci_ev_le_data_len_change {
#define HCI_EV_LE_DIRECT_ADV_REPORT 0x0B
struct hci_ev_le_direct_adv_info {
__u8 evt_type;
__u8 type;
__u8 bdaddr_type;
bdaddr_t bdaddr;
__u8 direct_addr_type;
@ -2508,6 +2508,11 @@ struct hci_ev_le_direct_adv_info {
__s8 rssi;
} __packed;
struct hci_ev_le_direct_adv_report {
__u8 num;
struct hci_ev_le_direct_adv_info info[];
} __packed;
#define HCI_EV_LE_PHY_UPDATE_COMPLETE 0x0c
struct hci_ev_le_phy_update_complete {
__u8 status;

26
net/bluetooth/hci_event.c
View File

@ -6881,19 +6881,31 @@ static void hci_le_remote_conn_param_req_evt(struct hci_dev *hdev,
static void hci_le_direct_adv_report_evt(struct hci_dev *hdev,
struct sk_buff *skb)
{
u8 num_reports = skb->data[0];
struct hci_ev_le_direct_adv_info *ev = (void *)&skb->data[1];
struct hci_ev_le_direct_adv_report *ev;
int i;
if (!num_reports || skb->len < num_reports * sizeof(*ev) + 1)
ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_DIRECT_ADV_REPORT,
sizeof(*ev));
if (!ev)
return;
if (!hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_DIRECT_ADV_REPORT,
flex_array_size(ev, info, ev->num)))
return;
if (!ev->num)
return;
hci_dev_lock(hdev);
for (; num_reports; num_reports--, ev++)
process_adv_report(hdev, ev->evt_type, &ev->bdaddr,
ev->bdaddr_type, &ev->direct_addr,
ev->direct_addr_type, ev->rssi, NULL, 0,
for (i = 0; i < ev->num; i++) {
struct hci_ev_le_direct_adv_info *info = &ev->info[i];
process_adv_report(hdev, info->type, &info->bdaddr,
info->bdaddr_type, &info->direct_addr,
info->direct_addr_type, info->rssi, NULL, 0,
false);
}
hci_dev_unlock(hdev);
}