diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-10-09 17:01:09 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-29 10:42:14 -0800 |
| commit | 5e13a42e913a83bbff33cf919d575778e8e76df7 (patch) | |
| tree | 1c3a9f7ce33700efb6f7effe700533dccae13720 /drivers | |
| parent | 2fe495a2b90d16e9f55905f70f001fda5c6897f4 (diff) | |
USB: mos7840: fix tiocmget error handling
commit a91ccd26e75235d86248d018fe3779732bcafd8d upstream.
Make sure to return errors from tiocmget rather than rely on
uninitialised stack data.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/serial/mos7840.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index 3bac4693c038..23dc9d1dc99e 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -1580,7 +1580,11 @@ static int mos7840_tiocmget(struct tty_struct *tty) return -ENODEV; status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr); + if (status != 1) + return -EIO; status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr); + if (status != 1) + return -EIO; result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0) |