usb: core: Prevent null pointer dereference in update_port_device_state

Currently, the function update_port_device_state gets the usb_hub from
udev->parent by calling usb_hub_to_struct_hub.
However, in case the actconfig or the maxchild is 0, the usb_hub would
be NULL and upon further accessing to get port_dev would result in null
pointer dereference.

Fix this by introducing an if check after the usb_hub is populated.

Fixes: 83cb2604f641 ("usb: core: add sysfs entry for usb device state")
Cc: stable@vger.kernel.org
Signed-off-by: Udipto Goswami <quic_ugoswami@quicinc.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20240110095814.7626-1-quic_ugoswami@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index ffd7c99e24a3624fba07e8277866a5526c6695eb..48409d51ea4380cd450617348e50bf3f22957686 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2053,9 +2053,19 @@ static void update_port_device_state(struct usb_device *udev)
 
        if (udev->parent) {
                hub = usb_hub_to_struct_hub(udev->parent);
-               port_dev = hub->ports[udev->portnum - 1];
-               WRITE_ONCE(port_dev->state, udev->state);
-               sysfs_notify_dirent(port_dev->state_kn);
+
+               /*
+                * The Link Layer Validation System Driver (lvstest)
+                * has a test step to unbind the hub before running the
+                * rest of the procedure. This triggers hub_disconnect
+                * which will set the hub's maxchild to 0, further
+                * resulting in usb_hub_to_struct_hub returning NULL.
+                */
+               if (hub) {
+                       port_dev = hub->ports[udev->portnum - 1];
+                       WRITE_ONCE(port_dev->state, udev->state);
+                       sysfs_notify_dirent(port_dev->state_kn);
+               }
        }
 }