On Mon, Apr 01, 2019 at 10:01:42AM -0700, Zubin Mithra wrote:
From: Myungho Jung mhjungk@gmail.com
commit e20a2e9c42c9e4002d9e338d74e7819e88d77162 upstream
When releasing socket, it is possible to enter hci_sock_release() and hci_sock_dev_event(HCI_DEV_UNREG) at the same time in different thread. The reference count of hdev should be decremented only once from one of them but if storing hdev to local variable in hci_sock_release() before detached from socket and setting to NULL in hci_sock_dev_event(), hci_dev_put(hdev) is unexpectedly called twice. This is resolved by referencing hdev from socket after bt_sock_unlink() in hci_sock_release().
Reported-by: syzbot+fdc00003f4efff43bc5b@syzkaller.appspotmail.com Signed-off-by: Myungho Jung mhjungk@gmail.com Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Zubin Mithra zsm@chromium.org
Now applied, thanks.
greg k-h