USB: mos7840: fix memory leak in open

Allocated urbs and buffers were never freed on errors in open.

Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 0a818b2..603fb70 100644 (file)
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -905,20 +905,20 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
        status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
        if (status < 0) {
                dev_dbg(&port->dev, "Reading Spreg failed\n");
-               return -1;
+               goto err;
        }
        Data |= 0x80;
        status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
        if (status < 0) {
                dev_dbg(&port->dev, "writing Spreg failed\n");
-               return -1;
+               goto err;
        }
 
        Data &= ~0x80;
        status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
        if (status < 0) {
                dev_dbg(&port->dev, "writing Spreg failed\n");
-               return -1;
+               goto err;
        }
        /* End of block to be checked */
 
@@ -927,7 +927,7 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
                                                                        &Data);
        if (status < 0) {
                dev_dbg(&port->dev, "Reading Controlreg failed\n");
-               return -1;
+               goto err;
        }
        Data |= 0x08;           /* Driver done bit */
        Data |= 0x20;           /* rx_disable */
@@ -935,7 +935,7 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
                                mos7840_port->ControlRegOffset, Data);
        if (status < 0) {
                dev_dbg(&port->dev, "writing Controlreg failed\n");
-               return -1;
+               goto err;
        }
        /* do register settings here */
        /* Set all regs to the device default values. */
@@ -946,21 +946,21 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
        status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
        if (status < 0) {
                dev_dbg(&port->dev, "disabling interrupts failed\n");
-               return -1;
+               goto err;
        }
        /* Set FIFO_CONTROL_REGISTER to the default value */
        Data = 0x00;
        status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
        if (status < 0) {
                dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
-               return -1;
+               goto err;
        }
 
        Data = 0xcf;
        status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
        if (status < 0) {
                dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
-               return -1;
+               goto err;
        }
 
        Data = 0x03;
@@ -1103,6 +1103,15 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
        /* mos7840_change_port_settings(mos7840_port,old_termios); */
 
        return 0;
+err:
+       for (j = 0; j < NUM_URBS; ++j) {
+               urb = mos7840_port->write_urb_pool[j];
+               if (!urb)
+                       continue;
+               kfree(urb->transfer_buffer);
+               usb_free_urb(urb);
+       }
+       return status;
 }
 
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