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tty: serial: fsl_lpuart: fix crash in lpuart_uport_is_active

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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: 4f5cb8c5e9 ("tty: serial: fsl_lpuart: enable wakeup source for lpuart")
Cc: stable <stable@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20230323110923.24581-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sherry Sun 2023-03-23 19:09:23 +08:00 committed by Greg Kroah-Hartman
parent 9425914f3d
commit 178e00f36f
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/fsl_lpuart.c
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@ -2948,7 +2948,7 @@ static bool lpuart_uport_is_active(struct lpuart_port *sport)
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);
}