Testing with KASAN and syzkaller revealed a bug in port.c:disable_store(): usb_hub_to_struct_hub() can return NULL if the hub that the port belongs to is concurrently removed, but the function does not check for this possibility before dereferencing the returned value. It turns out that the first dereference is unnecessary, since hub->intfdev is the parent of the port device, so it can be changed easily. Adding a check for hub == NULL prevents further problems. The same bug exists in the disable_show() routine, and it can be fixed the same way. Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Reported-and-tested-by: Yue Sun <samsun1006219@xxxxxxxxx> Reported-by: xingwei lee <xrivendell7@xxxxxxxxx> Link: https://lore.kernel.org/linux-usb/CAEkJfYON+ry7xPx=AiLR9jzUNT+i_Va68ACajOC3HoacOfL1ig@xxxxxxxxxxxxxx/ Fixes: f061f43d7418 ("usb: hub: port: add sysfs entry to switch port power") CC: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx> CC: stable@xxxxxxxxxxxxxxx --- drivers/usb/core/port.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) Index: usb-devel/drivers/usb/core/port.c =================================================================== --- usb-devel.orig/drivers/usb/core/port.c +++ usb-devel/drivers/usb/core/port.c @@ -51,13 +51,15 @@ static ssize_t disable_show(struct devic struct usb_port *port_dev = to_usb_port(dev); struct usb_device *hdev = to_usb_device(dev->parent->parent); struct usb_hub *hub = usb_hub_to_struct_hub(hdev); - struct usb_interface *intf = to_usb_interface(hub->intfdev); + struct usb_interface *intf = to_usb_interface(dev->parent); int port1 = port_dev->portnum; u16 portstatus, unused; bool disabled; int rc; struct kernfs_node *kn; + if (!hub) + return -ENODEV; hub_get(hub); rc = usb_autopm_get_interface(intf); if (rc < 0) @@ -101,12 +103,14 @@ static ssize_t disable_store(struct devi struct usb_port *port_dev = to_usb_port(dev); struct usb_device *hdev = to_usb_device(dev->parent->parent); struct usb_hub *hub = usb_hub_to_struct_hub(hdev); - struct usb_interface *intf = to_usb_interface(hub->intfdev); + struct usb_interface *intf = to_usb_interface(dev->parent); int port1 = port_dev->portnum; bool disabled; int rc; struct kernfs_node *kn; + if (!hub) + return -ENODEV; rc = kstrtobool(buf, &disabled); if (rc) return rc;
