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| author | Johan Hovold <johan@kernel.org> | 2017-01-03 16:39:52 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-12 11:39:16 +0100 |
| commit | 6ea44fb2183c6e4c4c7888e35498717f9d637c39 (patch) | |
| tree | 40520df368cbd14449cef6a9c6c5faae0aca7ed4 /drivers/usb | |
| parent | e7cf756c89326f8dcee8a109d092d73acc59d72e (diff) | |
| download | linux-rpi3-6ea44fb2183c6e4c4c7888e35498717f9d637c39.tar.gz linux-rpi3-6ea44fb2183c6e4c4c7888e35498717f9d637c39.tar.bz2 linux-rpi3-6ea44fb2183c6e4c4c7888e35498717f9d637c39.zip | |
USB: serial: mos7720: fix parport use-after-free on probe errors
commit 75dd211e773afcbc264677b0749d1cf7d937ab2d upstream.
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")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -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 d9d2b5e6a6f3..935a2dec3a9b 100644 --- a/drivers/usb/serial/mos7720.c +++ b/drivers/usb/serial/mos7720.c @@ -1955,22 +1955,20 @@ 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); |