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: [ ] kmalloc include/linux/slab.h:554 [inline] [ ] kzalloc include/linux/slab.h:684 [inline] [ ] usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582 [ ] hub_port_connect drivers/usb/core/hub.c:5129 [inline] [ ] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] [ ] port_event drivers/usb/core/hub.c:5509 [inline] [ ] hub_event+0x1171/0x20c0 drivers/usb/core/hub.c:5591 [ ] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275 [ ] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421 [ ] kthread+0x178/0x1b0 kernel/kthread.c:292 [ ] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294