diff options
| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2019-02-23 12:33:27 +0800 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2019-02-26 09:55:39 +0100 |
| commit | 56897b217a1d0a91c9920cb418d6b3fe922f590a (patch) | |
| tree | 9c50a376fe9717111aedcb6156c5e3aa32c4f19c /net/ipv4/esp4.c | |
| parent | 4a67e5d4adbf3b419f17924322f468ac5cb8c14f (diff) | |
Bluetooth: hci_ldisc: Postpone HCI_UART_PROTO_READY bit set in hci_uart_set_proto()
task A: task B:
hci_uart_set_proto flush_to_ldisc
- p->open(hu) -> h5_open //alloc h5 - receive_buf
- set_bit HCI_UART_PROTO_READY - tty_port_default_receive_buf
- hci_uart_register_dev - tty_ldisc_receive_buf
- hci_uart_tty_receive
- test_bit HCI_UART_PROTO_READY
- h5_recv
- clear_bit HCI_UART_PROTO_READY while() {
- p->open(hu) -> h5_close //free h5
- h5_rx_3wire_hdr
- h5_reset() //use-after-free
}
It could use ioctl to set hci uart proto, but there is
a use-after-free issue when hci_uart_register_dev() fail in
hci_uart_set_proto(), see stack above, fix this by setting
HCI_UART_PROTO_READY bit only when hci_uart_register_dev()
return success.
Reported-by: syzbot+899a33dc0fa0dbaf06a6@syzkaller.appspotmail.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Jeremy Cline <jcline@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/ipv4/esp4.c')
0 files changed, 0 insertions, 0 deletions