From: Dmitry Smirnov d.smirnov@inbox.lv

stable inclusion from stable-v5.10.222 commit 932a86a711c722b45ed47ba2103adca34d225b33 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAILG4 CVE: CVE-2024-42244

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit c15a688e49987385baa8804bf65d570e362f8576 upstream.

Since commit c49cfa917025 ("USB: serial: use generic method if no alternative is provided in usb serial layer"), USB serial core calls the generic resume implementation when the driver has not provided one.

This can trigger a crash on resume with mos7840 since support for multiple read URBs was added back in 2011. Specifically, both port read URBs are now submitted on resume for open ports, but the context pointer of the second URB is left set to the core rather than mos7840 port structure.

Fix this by implementing dedicated suspend and resume functions for mos7840.

Tested with Delock 87414 USB 2.0 to 4x serial adapter.

Signed-off-by: Dmitry Smirnov d.smirnov@inbox.lv [ johan: analyse crash and rewrite commit message; set busy flag on resume; drop bulk-in check; drop unnecessary usb_kill_urb() ] Fixes: d83b405383c9 ("USB: serial: add support for multiple read urbs") Cc: stable@vger.kernel.org # 3.3 Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yi Yang yiyang13@huawei.com --- drivers/usb/serial/mos7840.c | 45 ++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index 48a9a0476a45..e568bf566ab0 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -1764,6 +1764,49 @@ static int mos7840_port_remove(struct usb_serial_port *port) return 0; }

+static int mos7840_suspend(struct usb_serial *serial, pm_message_t message) +{ + struct moschip_port *mos7840_port; + struct usb_serial_port *port; + int i; + + for (i = 0; i < serial->num_ports; ++i) { + port = serial->port[i]; + if (!tty_port_initialized(&port->port)) + continue; + + mos7840_port = usb_get_serial_port_data(port); + + usb_kill_urb(mos7840_port->read_urb); + mos7840_port->read_urb_busy = false; + } + + return 0; +} + +static int mos7840_resume(struct usb_serial *serial) +{ + struct moschip_port *mos7840_port; + struct usb_serial_port *port; + int res; + int i; + + for (i = 0; i < serial->num_ports; ++i) { + port = serial->port[i]; + if (!tty_port_initialized(&port->port)) + continue; + + mos7840_port = usb_get_serial_port_data(port); + + mos7840_port->read_urb_busy = true; + res = usb_submit_urb(mos7840_port->read_urb, GFP_NOIO); + if (res) + mos7840_port->read_urb_busy = false; + } + + return 0; +} + static struct usb_serial_driver moschip7840_4port_device = { .driver = { .owner = THIS_MODULE, @@ -1792,6 +1835,8 @@ static struct usb_serial_driver moschip7840_4port_device = { .port_probe = mos7840_port_probe, .port_remove = mos7840_port_remove, .read_bulk_callback = mos7840_bulk_in_callback, + .suspend = mos7840_suspend, + .resume = mos7840_resume, };

static struct usb_serial_driver * const serial_drivers[] = {