[PATCH 5.15 204/207] serial: liteuart: Fix NULL pointer dereference in ->remove()

Greg Kroah-Hartman
2021-12-06T15:46:18Z

From: Ilia Sergachev <silia@ethz.ch>

commit 0f55f89d98c8b3e12b4f55f71c127a173e29557c upstream.

drvdata has to be set in _probe() - otherwise platform_get_drvdata()
causes null pointer dereference BUG in _remove().

Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ilia Sergachev <silia@ethz.ch>
Link: https://lore.kernel.org/r/20211115224944.23f8c12b@dtkw
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/liteuart.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/tty/serial/liteuart.c
+++ b/drivers/tty/serial/liteuart.c
@@ -285,6 +285,8 @@ static int liteuart_probe(struct platfor
port->line = dev_id;
spin_lock_init(&port->lock);

+ platform_set_drvdata(pdev, port);
+
return uart_add_one_port(&liteuart_driver, &uart->port);
}