This is a note to let you know that I've just added the patch titled
USB: serial: ch341: handle unbound port at reset_resume
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 4d5ef53f75c22d28f490bcc5c771fcc610a9afa4 Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Fri, 17 Jan 2020 10:50:22 +0100 Subject: USB: serial: ch341: handle unbound port at reset_resume
Check for NULL port data in reset_resume() to avoid dereferencing a NULL pointer in case the port device isn't bound to a driver (e.g. after a failed control request at port probe).
Fixes: 1ded7ea47b88 ("USB: ch341 serial: fix port number changed after resume") Cc: stable stable@vger.kernel.org # 2.6.30 Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Johan Hovold johan@kernel.org --- drivers/usb/serial/ch341.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index df582fe855f0..d3f420f3a083 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -642,9 +642,13 @@ static int ch341_tiocmget(struct tty_struct *tty) static int ch341_reset_resume(struct usb_serial *serial) { struct usb_serial_port *port = serial->port[0]; - struct ch341_private *priv = usb_get_serial_port_data(port); + struct ch341_private *priv; int ret;
+ priv = usb_get_serial_port_data(port); + if (!priv) + return 0; + /* reconfigure ch341 serial port after bus-reset */ ch341_configure(serial->dev, priv);