[PATCH v2 2/2] tty/vt: prevent registration of console with invalid number

Sven Schnelle
2022-12-09T11:28:12Z

If a user specifies an invalid console like 'console=tty3000',
the vt driver should prevent setting up a vt entry for that.

Suggested-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
---
drivers/tty/vt/vt.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 981d2bfcf9a5..62c8a45ad731 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3156,8 +3156,14 @@ static struct tty_driver *vt_console_device(struct console *c, int *index)
return console_driver;
}

+static int vt_console_setup(struct console *co, char *options)
+{
+ return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
+}
+
static struct console vt_console_driver = {
.name = "tty",
+ .setup = vt_console_setup,
.write = vt_console_print,
.device = vt_console_device,
.unblank = unblank_screen,
--
2.34.1