[PATCH 4.9 046/175] serial_core: Check for port state when tty is in error state

Greg Kroah-Hartman
2020-12-28T13:01:55Z

From: Alexey Kardashevskiy <aik@ozlabs.ru>

commit 2f70e49ed860020f5abae4f7015018ebc10e1f0e upstream.

At the moment opening a serial device node (such as /dev/ttyS3)
succeeds even if there is no actual serial device behind it.
Reading/writing/ioctls fail as expected because the uart port is not
initialized (the type is PORT_UNKNOWN) and the TTY_IO_ERROR error state
bit is set fot the tty.

However setting line discipline does not have these checks
8250_port.c (8250 is the default choice made by univ8250_console_init()).
As the result of PORT_UNKNOWN, uart_port::iobase is NULL which
a platform translates onto some address accessing which produces a crash
like below.

This adds tty_port_initialized() to uart_set_ldisc() to prevent the crash.

Found by syzkaller.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Link: https://lore.kernel.org/r/20201203055834.45838-1-aik@ozlabs.ru
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/tty/serial/serial_core.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1415,6 +1415,10 @@ static void uart_set_ldisc(struct tty_st
{
struct uart_state *state = tty->driver_data;
struct uart_port *uport;
+ struct tty_port *port = &state->port;
+
+ if (!tty_port_initialized(port))
+ return;

mutex_lock(&state->port.mutex);
uport = uart_port_check(state);