From: Oliver Neukum <[EMAIL PROTECTED]>
this fixes a small race in visor_write.
Signed-off-by: Oliver Neukum <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
drivers/usb/serial/visor.c | 22 ++++++++++++++++------
1 files changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 2f59ff2..ffbe601 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -384,19 +384,21 @@ static int visor_write (struct usb_serial_port *port,
const unsigned char *buf,
dbg("%s - write limit hit\n", __FUNCTION__);
return 0;
}
+ priv->outstanding_urbs++;
spin_unlock_irqrestore(&priv->lock, flags);
buffer = kmalloc (count, GFP_ATOMIC);
if (!buffer) {
dev_err(&port->dev, "out of memory\n");
- return -ENOMEM;
+ count = -ENOMEM;
+ goto error_no_buffer;
}
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
dev_err(&port->dev, "no more free urbs\n");
- kfree (buffer);
- return -ENOMEM;
+ count = -ENOMEM;
+ goto error_no_urb;
}
memcpy (buffer, buf, count);
@@ -415,19 +417,27 @@ static int visor_write (struct usb_serial_port *port,
const unsigned char *buf,
dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed
with status = %d\n",
__FUNCTION__, status);
count = status;
- kfree (buffer);
+ goto error;
} else {
spin_lock_irqsave(&priv->lock, flags);
- ++priv->outstanding_urbs;
priv->bytes_out += count;
spin_unlock_irqrestore(&priv->lock, flags);
}
/* we are done with this urb, so let the host driver
* really free it when it is finished with it */
- usb_free_urb (urb);
+ usb_free_urb(urb);
return count;
+error:
+ usb_free_urb(urb);
+error_no_urb:
+ kfree(buffer);
+error_no_buffer:
+ spin_lock_irqsave(&priv->lock, flags);
+ --priv->outstanding_urbs;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return count;
}
--
1.5.1.2
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