Describe CVE-2021-47133.
What is CVE-2021-47133?
In the Linux kernel, the following vulnerability has been resolved:

HID: amd_sfh: Fix memory leak in amd_sfh_work

Kmemleak tool detected a memory leak in the amd_sfh driver.

====================
unreferenced object 0xffff88810228ada0 (size 32):
  comm "insmod", pid 3968, jiffies 4295056001 (age 775.792s)
  hex dump (first 32 bytes):
    00 20 73 1f 81 88 ff ff 00 01 00 00 00 00 ad de  . s.............
    22 01 00 00 00 00 ad de 01 00 02 00 00 00 00 00  "...............
  backtrace:
    [<000000007b4c8799>] kmem_cache_alloc_trace+0x163/0x4f0
    [<0000000005326893>] amd_sfh_get_report+0xa4/0x1d0 [amd_sfh]
    [<000000002a9e5ec4>] amdtp_hid_request+0x62/0x80 [amd_sfh]
    [<00000000b8a95807>] sensor_hub_get_feature+0x145/0x270 [hid_sensor_hub]
    [<00000000fda054ee>] hid_sensor_parse_common_attributes+0x215/0x460 [hid_sensor_iio_common]
    [<0000000021279ecf>] hid_accel_3d_probe+0xff/0x4a0 [hid_sensor_accel_3d]
    [<00000000915760ce>] platform_probe+0x6a/0xd0
    [<0000000060258a1f>] really_probe+0x192/0x620
    [<00000000fa812f2d>] driver_probe_device+0x14a/0x1d0
    [<000000005e79f7fd>] __device_attach_driver+0xbd/0x110
    [<0000000070d15018>] bus_for_each_drv+0xfd/0x160
    [<0000000013a3c312>] __device_attach+0x18b/0x220
    [<000000008c7b4afc>] device_initial_probe+0x13/0x20
    [<00000000e6e99665>] bus_probe_device+0xfe/0x120
    [<00000000833fa90b>] device_add+0x6a6/0xe00
    [<00000000fa901078>] platform_device_add+0x180/0x380
====================

The fix is to freeing request_list entry once the processed entry is
removed from the request_list..