CVE-2021-47058 Information

Description

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( egmap: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.

Reference

https://git.kernel.org/stable/c/2dc1554d5f0fdaf47cc5bea442b84b9226fea867 https://git.kernel.org/stable/c/d8897f7b2283a500666c85ef06e820df38ed7b52 https://git.kernel.org/stable/c/eb949f891226c012138ffd9df90d1e509f428ae6 https://git.kernel.org/stable/c/c764e375ae647832de1ee73d43a4bb3ef8a8f43d https://git.kernel.org/stable/c/b9e569ae1da3a113b3acee8703c94777fd20938a https://git.kernel.org/stable/c/e41a962f82e7afb5b1ee644f48ad0b3aee656268