Bluetooth: Correct packet len calculation
Remove unneeded skb_pull and correct packet length calculation
removing magic number. Move BT_DBG after len check otherwise
it could possibly access wrong memory.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 08c0b42..d37f5b2 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2271,20 +2271,19 @@
struct hci_ev_num_comp_pkts *ev = (void *) skb->data;
int i;
- skb_pull(skb, sizeof(*ev));
-
- BT_DBG("%s num_hndl %d", hdev->name, ev->num_hndl);
-
if (hdev->flow_ctl_mode != HCI_FLOW_CTL_MODE_PACKET_BASED) {
BT_ERR("Wrong event for mode %d", hdev->flow_ctl_mode);
return;
}
- if (skb->len < ev->num_hndl * 4) {
+ if (skb->len < sizeof(*ev) || skb->len < sizeof(*ev) +
+ ev->num_hndl * sizeof(struct hci_comp_pkts_info)) {
BT_DBG("%s bad parameters", hdev->name);
return;
}
+ BT_DBG("%s num_hndl %d", hdev->name, ev->num_hndl);
+
for (i = 0; i < ev->num_hndl; i++) {
struct hci_comp_pkts_info *info = &ev->handles[i];
struct hci_conn *conn;