CVE-2021-47173

In the Linux kernel, the following vulnerability has been resolved:
misc/uss720: fix memory leak in uss720_probe uss720_probe forgets to
decrease the refcount of usbdev in uss720_probe. Fix this by decreasing the
refcount of usbdev by usb_put_dev. BUG: memory leak unreferenced object
0xffff888101113800 (size 2048): comm “kworker/0:1”, pid 7, jiffies
4294956777 (age 28.870s) hex dump (first 32 bytes): ff ff ff ff 31 00 00 00
00 00 00 00 00 00 00 00 …1… 00 00 00 00 00 00 00 00 00 00 00
00 03 00 00 00 … backtrace: [<ffffffff82b8e822>] kmalloc
include/linux/slab.h:554 [inline] [<ffffffff82b8e822>] kzalloc
include/linux/slab.h:684 [inline] [<ffffffff82b8e822>]
usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582 [<ffffffff82b98441>]
hub_port_connect drivers/usb/core/hub.c:5129 [inline] [<ffffffff82b98441>]
hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
[<ffffffff82b98441>] port_event drivers/usb/core/hub.c:5509 [inline]
[<ffffffff82b98441>] hub_event+0x1171/0x20c0 drivers/usb/core/hub.c:5591
[<ffffffff81259229>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
[<ffffffff81259b19>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421
[<ffffffff81261228>] kthread+0x178/0x1b0 kernel/kthread.c:292
[<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294