Commit 5d714615 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

NFC: nfcmrvl_uart: add missing tty-device sanity check

commit 15e0c59f upstream.

Make sure to check the tty-device pointer before trying to access the
parent device to avoid dereferencing a NULL-pointer when the tty is one
end of a Unix98 pty.

Fixes: e097dc62 ("NFC: nfcmrvl: add UART driver")
Cc: Vincent Cuissard <cuissard@marvell.com>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3e540b65
......@@ -109,6 +109,7 @@ static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
struct nfcmrvl_private *priv;
struct nfcmrvl_platform_data *pdata = NULL;
struct nfcmrvl_platform_data config;
struct device *dev = nu->tty->dev;
/*
* Platform data cannot be used here since usually it is already used
......@@ -116,9 +117,8 @@ static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
* and check if DT entries were added.
*/
if (nu->tty->dev->parent && nu->tty->dev->parent->of_node)
if (nfcmrvl_uart_parse_dt(nu->tty->dev->parent->of_node,
&config) == 0)
if (dev && dev->parent && dev->parent->of_node)
if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
pdata = &config;
if (!pdata) {
......@@ -131,7 +131,7 @@ static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
}
priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
nu->tty->dev, pdata);
dev, pdata);
if (IS_ERR(priv))
return PTR_ERR(priv);
......
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