On Thu, Sep 10, 2020 at 10:04:24AM +0530, Anmol Karn wrote:
> Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
> as NULL. Fix it by adding pointer check for it.
>
> Reported-and-tested-by: syzbot+0bef568258653cff2...@syzkaller.appspotmail.com
> Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f
> Signed-off-by: Anmol Karn <anmol.karan...@gmail.com>
> ---
> net/bluetooth/hci_event.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 4b7fc430793c..871e16804433 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev
> *hdev,
> return;
> }
>
> + if (IS_ERR_OR_NULL(hcon->amp_mgr)) {
It can't be an error pointer. Shouldn't we call hci_conn_del() on this
path? Try to find the Fixes tag to explain how this bug was introduced.
(Don't rush to send a v2. The patch requires quite a bit more digging
and detective work before it is ready).
> + hci_dev_unlock(hdev);
> + return;
> + }
> +
> if (ev->status) {
> hci_conn_del(hcon);
> hci_dev_unlock(hdev);
regards,
dan carpenter
