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USB-serial fixes for 5.8-rc6

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Here's a fix for 5.8 addressing a long-standing bug in iuu_phoenix.
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Merge tag 'usb-serial-5.8-rc6' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-linus

Johan writes:

USB-serial fixes for 5.8-rc6

Here's a fix for 5.8 addressing a long-standing bug in iuu_phoenix.

* tag 'usb-serial-5.8-rc6' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
  USB: serial: iuu_phoenix: fix memory corruption
This commit is contained in:
Greg Kroah-Hartman 2020-07-16 17:30:59 +02:00
commit c7300cdf8f
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); struct iuu_private *priv = usb_get_serial_port_data(port);
unsigned long flags; unsigned long flags;
if (count > 256)
return -ENOMEM;
spin_lock_irqsave(&priv->lock, flags); spin_lock_irqsave(&priv->lock, flags);
count = min(count, 256 - priv->writelen);
if (count == 0)
goto out;
/* fill the buffer */ /* fill the buffer */
memcpy(priv->writebuf + priv->writelen, buf, count); memcpy(priv->writebuf + priv->writelen, buf, count);
priv->writelen += count; priv->writelen += count;
out:
spin_unlock_irqrestore(&priv->lock, flags); spin_unlock_irqrestore(&priv->lock, flags);
return count; return count;