This is a note to let you know that I've just added the patch titled
tty: serial: fsl_lpuart: fix crash in lpuart_uport_is_active
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tty-serial-fsl_lpuart-fix-crash-in-lpuart_uport_is_active.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 178e00f36f934a88682d96aa046c1f90cb6f83a7 Mon Sep 17 00:00:00 2001
From: Sherry Sun <sherry.sun@xxxxxxx>
Date: Thu, 23 Mar 2023 19:09:23 +0800
Subject: tty: serial: fsl_lpuart: fix crash in lpuart_uport_is_active
From: Sherry Sun <sherry.sun@xxxxxxx>
commit 178e00f36f934a88682d96aa046c1f90cb6f83a7 upstream.
For serdev framework, tty->dev is a NULL pointer, lpuart_uport_is_active
calling device_may_wakeup() may cause kernel NULL pointer crash, so here
add the NULL pointer check before using it.
Fixes: 4f5cb8c5e915 ("tty: serial: fsl_lpuart: enable wakeup source for lpuart")
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx>
Link: https://lore.kernel.org/r/20230323110923.24581-1-sherry.sun@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2896,7 +2896,7 @@ static bool lpuart_uport_is_active(struc
tty = tty_port_tty_get(port);
if (tty) {
tty_dev = tty->dev;
- may_wake = device_may_wakeup(tty_dev);
+ may_wake = tty_dev && device_may_wakeup(tty_dev);
tty_kref_put(tty);
}
Patches currently in stable-queue which might be from sherry.sun@xxxxxxx are
queue-6.2/tty-serial-fsl_lpuart-fix-crash-in-lpuart_uport_is_active.patch
queue-6.2/tty-serial-fsl_lpuart-avoid-checking-for-transfer-complete-when-uartctrl_sbk-is-asserted-in-lpuart32_tx_empty.patch
