Hi Gustavo,
> > 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@xxxxxxxxx>
> > ---
> > net/bluetooth/hci_event.c | 9 ++++-----
> > 1 files changed, 4 insertions(+), 5 deletions(-)
> >
> > diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> > index 919e3c0..47e1476 100644
> > --- a/net/bluetooth/hci_event.c
> > +++ b/net/bluetooth/hci_event.c
> > @@ -2266,20 +2266,19 @@ static inline void hci_num_comp_pkts_evt(struct hci_dev *hdev, struct sk_buff *s
> > 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)) {
>
> I think you can remove the first part of this check.
you are accessing ev->num_handl, so you need to ensure that you have at
least ev->num_handl size of data in your SKB. So this code is correct.
Regards
Marcel
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