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    Subject[PATCH 4.9 70/71] i2c: robotfuzz-osif: fix control-request directions
    Date
    From: Johan Hovold <johan@kernel.org>

    commit 4ca070ef0dd885616ef294d269a9bf8e3b258e1a upstream.

    The direction of the pipe argument must match the request-type direction
    bit or control requests may fail depending on the host-controller-driver
    implementation.

    Control transfers without a data stage are treated as OUT requests by
    the USB stack and should be using usb_sndctrlpipe(). Failing to do so
    will now trigger a warning.

    Fix the OSIFI2C_SET_BIT_RATE and OSIFI2C_STOP requests which erroneously
    used the osif_usb_read() helper and set the IN direction bit.

    Reported-by: syzbot+9d7dadd15b8819d73f41@syzkaller.appspotmail.com
    Fixes: 83e53a8f120f ("i2c: Add bus driver for for OSIF USB i2c device.")
    Cc: stable@vger.kernel.org # 3.14
    Signed-off-by: Johan Hovold <johan@kernel.org>
    Signed-off-by: Wolfram Sang <wsa@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/i2c/busses/i2c-robotfuzz-osif.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/drivers/i2c/busses/i2c-robotfuzz-osif.c b/drivers/i2c/busses/i2c-robotfuzz-osif.c
    index 89d8b41b6668..032e8535e860 100644
    --- a/drivers/i2c/busses/i2c-robotfuzz-osif.c
    +++ b/drivers/i2c/busses/i2c-robotfuzz-osif.c
    @@ -89,7 +89,7 @@ static int osif_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
    }
    }

    - ret = osif_usb_read(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
    + ret = osif_usb_write(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
    if (ret) {
    dev_err(&adapter->dev, "failure sending STOP\n");
    return -EREMOTEIO;
    @@ -159,7 +159,7 @@ static int osif_probe(struct usb_interface *interface,
    * Set bus frequency. The frequency is:
    * 120,000,000 / ( 16 + 2 * div * 4^prescale).
    * Using dev = 52, prescale = 0 give 100KHz */
    - ret = osif_usb_read(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
    + ret = osif_usb_write(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
    NULL, 0);
    if (ret) {
    dev_err(&interface->dev, "failure sending bit rate");
    --
    2.30.2
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