• Johan Hovold's avatar
    USB: serial: io_ti: fix another NULL-deref at open · 4f9785cc
    Johan Hovold authored
    In case a device is left in "boot-mode" we must not register any port
    devices in order to avoid a NULL-pointer dereference on open due to
    missing endpoints. This could be used by a malicious device to trigger
    an OOPS:
    
    Unable to handle kernel NULL pointer dereference at virtual address 00000030
    ...
    [<bf0caa84>] (edge_open [io_ti]) from [<bf0b0118>] (serial_port_activate+0x68/0x98 [usbserial])
    [<bf0b0118>] (serial_port_activate [usbserial]) from [<c0470ca4>] (tty_port_open+0x9c/0xe8)
    [<c0470ca4>] (tty_port_open) from [<bf0b0da0>] (serial_open+0x48/0x6c [usbserial])
    [<bf0b0da0>] (serial_open [usbserial]) from [<c0469178>] (tty_open+0xcc/0x5cc)
    
    Fixes: 1da177e4 ("Linux-2.6.12-rc2")
    Cc: stable <stable@vger.kernel.org>
    Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
    4f9785cc
io_ti.c 76.4 KB