diff options
| author | Myungho Jung <mhjungk@gmail.com> | 2019-02-02 16:56:36 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-27 09:33:47 +0200 |
| commit | 59ae59920af83903fa5fd73ebe8850c1860198d9 (patch) | |
| tree | b25046a1460d7bef16d6e3f5caf3ecac688476da /include/linux/ring_buffer.h | |
| parent | 02bfc06ca2fa1158d6cd2e5688bfc4ef278d8425 (diff) | |
Bluetooth: Fix decrementing reference count twice in releasing socket
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/ring_buffer.h')
0 files changed, 0 insertions, 0 deletions