lkml.org 
[lkml]   [2017]   [Jan]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.4 044/101] USB: serial: mos7720: fix use-after-free on probe errors
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Johan Hovold <johan@kernel.org>

    commit 91a1ff4d53c5184d383d0baeeaeab6f9736f2ff3 upstream.

    The interrupt URB was submitted on probe but never stopped on probe
    errors. This can lead to use-after-free issues in the completion
    handler when accessing the freed usb-serial struct:

    Unable to handle kernel paging request at virtual address 6b6b6be7
    ...
    [<bf052e70>] (mos7715_interrupt_callback [mos7720]) from [<c052a894>] (__usb_hcd_giveback_urb+0x80/0x140)
    [<c052a894>] (__usb_hcd_giveback_urb) from [<c052a9a4>] (usb_hcd_giveback_urb+0x50/0x138)
    [<c052a9a4>] (usb_hcd_giveback_urb) from [<c0550684>] (musb_giveback+0xc8/0x1cc)

    Fixes: b69578df7e98 ("USB: usbserial: mos7720: add support for parallel port on moschip 7715")
    Signed-off-by: Johan Hovold <johan@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/serial/mos7720.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    --- a/drivers/usb/serial/mos7720.c
    +++ b/drivers/usb/serial/mos7720.c
    @@ -1965,8 +1965,10 @@ static int mos7720_startup(struct usb_se
    #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
    if (product == MOSCHIP_DEVICE_ID_7715) {
    ret_val = mos7715_parport_init(serial);
    - if (ret_val < 0)
    + if (ret_val < 0) {
    + usb_kill_urb(serial->port[0]->interrupt_in_urb);
    return ret_val;
    + }
    }
    #endif
    /* LSR For Port 1 */
    @@ -1978,6 +1980,8 @@ static int mos7720_startup(struct usb_se

    static void mos7720_release(struct usb_serial *serial)
    {
    + usb_kill_urb(serial->port[0]->interrupt_in_urb);
    +
    #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
    /* close the parallel port */


    \
     
     \ /
      Last update: 2017-01-10 16:09    [W:4.073 / U:0.028 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site