[PATCH 4.14 064/242] Bluetooth: Fix slab-out-of-bounds read in hci_le_direct_adv_report_evt()

[Greg Kroah-Hartman]

From: Peilin Ye <yepeilin...@gmail.com>

commit f7e0e8b2f1b0a09b527885babda3e912ba820798 upstream.

`num_reports` is not being properly checked. A malformed event packet with
a large `num_reports` number makes hci_le_direct_adv_report_evt() read out
of bounds. Fix it.

Cc: sta...@vger.kernel.org
Fixes: 2f010b55884e ("Bluetooth: Add support for handling LE Direct Advertising 
Report events")
Reported-and-tested-by: syzbot+24ebd650e20bd263c...@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=24ebd650e20bd263ca01
Signed-off-by: Peilin Ye <yepeilin...@gmail.com>
Signed-off-by: Marcel Holtmann <mar...@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 net/bluetooth/hci_event.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -5141,20 +5141,18 @@ static void hci_le_direct_adv_report_evt
                                         struct sk_buff *skb)
 {
        u8 num_reports = skb->data[0];
-       void *ptr = &skb->data[1];
+       struct hci_ev_le_direct_adv_info *ev = (void *)&skb->data[1];
 
-       hci_dev_lock(hdev);
+       if (!num_reports || skb->len < num_reports * sizeof(*ev) + 1)
+               return;
 
-       while (num_reports--) {
-               struct hci_ev_le_direct_adv_info *ev = ptr;
+       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);
 
-               ptr += sizeof(*ev);
-       }
-
        hci_dev_unlock(hdev);
 }