i2c: robotfuzz-osif: fix control-request directions

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>

diff --git a/drivers/i2c/busses/i2c-robotfuzz-osif.c b/drivers/i2c/busses/i2c-robotfuzz-osif.c
index a39f7d0..66dfa21 100644 (file)
--- a/drivers/i2c/busses/i2c-robotfuzz-osif.c
+++ b/drivers/i2c/busses/i2c-robotfuzz-osif.c
@@ -83,7 +83,7 @@ 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;
@@ -153,7 +153,7 @@ 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");