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USB: serial: iuu_phoenix: fix memory corruption

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commit e7b931bee739e8a77ae216e613d3b99342b6dec0 upstream.

The driver would happily overwrite its write buffer with user data in
256 byte increments due to a removed buffer-space sanity check.

Fixes: 5fcf62b0f1 ("tty: iuu_phoenix: fix locking.")
Cc: stable <stable@vger.kernel.org>     # 2.6.31
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2020-07-15 11:02:45 +02:00 committed by Greg Kroah-Hartman
parent 72596d0b2a
commit 18059e953e
1 changed files with 5 additions and 3 deletions
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8
drivers/usb/serial/iuu_phoenix.c
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@ -697,14 +697,16 @@ static int iuu_uart_write(struct tty_struct *tty, struct usb_serial_port *port,
struct iuu_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
if (count > 256)
return -ENOMEM;
spin_lock_irqsave(&priv->lock, flags);
count = min(count, 256 - priv->writelen);
if (count == 0)
goto out;
/* fill the buffer */
memcpy(priv->writebuf + priv->writelen, buf, count);
priv->writelen += count;
out:
spin_unlock_irqrestore(&priv->lock, flags);
return count;