| Message ID | 20200930141813.410209-1-anmol.karan123@gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | net: bluetooth: Fix null pointer dereference in hci_event_packet() | expand |
Hi Anmol, > AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon. > > - net/bluetooth/hci_event.c:4945 > The bug seems to get triggered in this line: > > bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon; > > Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status. > > Fixes: d5e911928bd8 ("Bluetooth: AMP: Process Physical Link Complete evt") > Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com > Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f > Signed-off-by: Anmol Karn <anmol.karan123@gmail.com> > --- > Change in v3: > - changed return o; to return; (Reported-by: kernel test robot <lkp@intel.com> > ) > > net/bluetooth/hci_event.c | 5 +++++ > 1 file changed, 5 insertions(+) patch has been applied to bluetooth-next tree. Regards Marcel
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 4b7fc430793c..bbe0ca42cad2 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 (!hcon->amp_mgr) { + hci_dev_unlock(hdev); + return; + } + if (ev->status) { hci_conn_del(hcon); hci_dev_unlock(hdev);
AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon. - net/bluetooth/hci_event.c:4945 The bug seems to get triggered in this line: bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon; Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status. Fixes: d5e911928bd8 ("Bluetooth: AMP: Process Physical Link Complete evt") Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f Signed-off-by: Anmol Karn <anmol.karan123@gmail.com> --- Change in v3: - changed return o; to return; (Reported-by: kernel test robot <lkp@intel.com> ) net/bluetooth/hci_event.c | 5 +++++ 1 file changed, 5 insertions(+)