From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
commit a553add0846f355a28ed4e81134012e4a1e280c2 upstream.
Call uart_unregister_driver() conditionally instead of
unconditionally, only if it has been previously registered.
This uses driver.state, just as the sh-sci.c driver does.
Fixes this null pointer dereference in tty_unregister_driver(),
since the 'driver' argument is null:
general protection fault: 0000 [#1] PREEMPT SMP KASAN PTI
RIP: 0010:tty_unregister_driver+0x25/0x1d0
Fixes: 238b8721a554 ("[PATCH] serial uartlite driver")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Cc: Peter Korsgaard <jacmet@xxxxxxxxxx>
Link: https://lore.kernel.org/r/9c8e6581-6fcc-a595-0897-4d90f5d710df@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/uartlite.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -746,7 +746,8 @@ err_uart:
static void __exit ulite_exit(void)
{
platform_driver_unregister(&ulite_platform_driver);
- uart_unregister_driver(&ulite_uart_driver);
+ if (ulite_uart_driver.state)
+ uart_unregister_driver(&ulite_uart_driver);
}
module_init(ulite_init);
