CVE-2021-47058

In the Linux kernel, the following vulnerability has been resolved: regmap:
set debugfs_name to NULL after it is freed There is a upstream commit
cffa4b2122f5(“regmap:debugfs: Fix a memory leak when calling
regmap_attach_dev”) that adds a if condition when create name for
debugfs_name. With below function invoking logical, debugfs_name is freed
in regmap_debugfs_exit(), but it is not created again because of the if
condition introduced by above commit. regmap_reinit_cache()
regmap_debugfs_exit() … regmap_debugfs_init() So, set debugfs_name to
NULL after it is freed.