imx: Check for NULL pointer deref before calling tty_encode_baud_rate

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 285b414f3054..5d7b58f1fe42 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -924,11 +924,13 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
         rational_best_approximation(16 * div * baud, sport->port.uartclk,
                 1 << 16, 1 << 16, &num, &denom);
 
-        tdiv64 = sport->port.uartclk;
-        tdiv64 *= num;
-        do_div(tdiv64, denom * 16 * div);
-        tty_encode_baud_rate(sport->port.info->port.tty,
-                (speed_t)tdiv64, (speed_t)tdiv64);
+        if (port->info && port->info->port.tty) {
+                tdiv64 = sport->port.uartclk;
+                tdiv64 *= num;
+                do_div(tdiv64, denom * 16 * div);
+                tty_encode_baud_rate(sport->port.info->port.tty,
+                                (speed_t)tdiv64, (speed_t)tdiv64);
+        }
 
         num -= 1;
         denom -= 1;