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| author | Johan Hovold <johan@kernel.org> | 2017-01-03 16:39:52 +0100 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2017-01-04 10:37:19 +0100 |
| commit | 75dd211e773afcbc264677b0749d1cf7d937ab2d (patch) | |
| tree | 78c903f206950fd0f2573e95ac9e6c98e1f89e01 | |
| parent | 91a1ff4d53c5184d383d0baeeaeab6f9736f2ff3 (diff) | |
| download | linux-75dd211e773afcbc264677b0749d1cf7d937ab2d.tar.gz linux-75dd211e773afcbc264677b0749d1cf7d937ab2d.tar.bz2 linux-75dd211e773afcbc264677b0749d1cf7d937ab2d.zip | |
USB: serial: mos7720: fix parport use-after-free on probe errors
Do not submit the interrupt URB until after the parport has been
successfully registered to avoid another use-after-free in the
completion handler when accessing the freed parport private data in case
of a racing completion.
Fixes: b69578df7e98 ("USB: usbserial: mos7720: add support for parallel
port on moschip 7715")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
| -rw-r--r-- | drivers/usb/serial/mos7720.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c index 9170ae856b34..e494821ae528 100644 --- a/drivers/usb/serial/mos7720.c +++ b/drivers/usb/serial/mos7720.c @@ -1952,22 +1952,20 @@ static int mos7720_startup(struct usb_serial *serial) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000); - /* start the interrupt urb */ - ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); - if (ret_val) - dev_err(&dev->dev, - "%s - Error %d submitting control urb\n", - __func__, ret_val); - #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT if (product == MOSCHIP_DEVICE_ID_7715) { ret_val = mos7715_parport_init(serial); - if (ret_val < 0) { - usb_kill_urb(serial->port[0]->interrupt_in_urb); + if (ret_val < 0) return ret_val; - } } #endif + /* start the interrupt urb */ + ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); + if (ret_val) { + dev_err(&dev->dev, "failed to submit interrupt urb: %d\n", + ret_val); + } + /* LSR For Port 1 */ read_mos_reg(serial, 0, MOS7720_LSR, &data); dev_dbg(&dev->dev, "LSR:%x\n", data); |