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NFC: nfcmrvl_uart: add missing tty-device sanity check

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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: e097dc624f ("NFC: nfcmrvl: add UART driver")
Cc: stable <stable@vger.kernel.org>     # 4.2
Cc: Vincent Cuissard <cuissard@marvell.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Johan Hovold 2017-03-30 12:15:36 +02:00 • committed by Samuel Ortiz
parent 20777bc57c
commit 15e0c59f15
1 changed files with 4 additions and 4 deletions
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8
drivers/nfc/nfcmrvl/uart.c
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@ -109,6 +109,7 @@ static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
struct nfcmrvl_private *priv; struct nfcmrvl_private *priv;
struct nfcmrvl_platform_data *pdata = NULL; struct nfcmrvl_platform_data *pdata = NULL;
struct nfcmrvl_platform_data config; struct nfcmrvl_platform_data config;
struct device *dev = nu->tty->dev;
/* /*
* Platform data cannot be used here since usually it is already used * 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. * and check if DT entries were added.
*/ */
if (nu->tty->dev->parent && nu->tty->dev->parent->of_node) if (dev && dev->parent && dev->parent->of_node)
if (nfcmrvl_uart_parse_dt(nu->tty->dev->parent->of_node, if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
&config) == 0)
pdata = &config; pdata = &config;
if (!pdata) { 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, priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
nu->tty->dev, pdata); dev, pdata);
if (IS_ERR(priv)) if (IS_ERR(priv))
return PTR_ERR(priv); return PTR_ERR(priv);