drivers/tty/serial/pch_uart.c: don't oops if dmi_get_system_info returns NULL

If dmi_get_system_info() returns NULL, pch_uart_init_port() will
dereferencea a zero pointer.

This oops was observed on an Atom based board which has no BIOS, but
a bootloder which doesn't provide DMI data.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Cc: Greg KH <gregkh@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index f2cb7503fcb2..465210930890 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1397,6 +1397,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
         int fifosize, base_baud;
         int port_type;
         struct pch_uart_driver_data *board;
+        const char *board_name;
 
         board = &drv_dat[id->driver_data];
         port_type = board->port_type;
@@ -1412,7 +1413,8 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
         base_baud = 1843200; /* 1.8432MHz */
 
         /* quirk for CM-iTC board */
-        if (strstr(dmi_get_system_info(DMI_BOARD_NAME), "CM-iTC"))
+        board_name = dmi_get_system_info(DMI_BOARD_NAME);
+        if (board_name && strstr(board_name, "CM-iTC"))
                 base_baud = 192000000; /* 192.0MHz */
 
         switch (port_type) {