USB: misc/vstusb, fix lock imbalance

Make sure we don't leak locked vstdev->lock in vstusb_write. Unlock
properly on one fail path.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/misc/vstusb.c b/drivers/usb/misc/vstusb.c
index 63dff9ba73c5d074bcd87ba13fcd4188dce81960..f26ea8dc15773dd8d3393ce25e92238c32fc99c2 100644 (file)
--- a/drivers/usb/misc/vstusb.c
+++ b/drivers/usb/misc/vstusb.c
@@ -401,6 +401,7 @@ static ssize_t vstusb_write(struct file *file, const char __user *buffer,
        }
 
        if (copy_from_user(buf, buffer, count)) {
+               mutex_unlock(&vstdev->lock);
                dev_err(&dev->dev, "%s: can't copy_from_user\n", __func__);
                retval = -EFAULT;
                goto exit;