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Bluetooth: Fix null pointer dereference in hci_event_packet()

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[ Upstream commit 6dfccd13db2ff2b709ef60a50163925d477549aa ]

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>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anmol Karn 2020-09-30 19:48:13 +05:30 committed by Greg Kroah-Hartman
parent d92b81fad0
commit 5cf3c2e789
1 changed files with 5 additions and 0 deletions
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5
net/bluetooth/hci_event.c
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@ -4791,6 +4791,11 @@ 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);