title: regmap: set debugfs_name to NULL after it is freed
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("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.
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5b654b030079, lessThan: 2dc1554d5f0f, status: affected, versionType: git
version: 480c5e9c7e4c, lessThan: d8897f7b2283, status: affected, versionType: git
version: c9698380b01a, lessThan: eb949f891226, status: affected, versionType: git
version: cffa4b2122f5, lessThan: c764e375ae64, status: affected, versionType: git
version: cffa4b2122f5, lessThan: b9e569ae1da3, status: affected, versionType: git
version: cffa4b2122f5, lessThan: e41a962f82e7, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5.11, status: affected
version: 0, lessThan: 5.11, status: unaffected, versionType: custom
version: 4.19.191, lessThanOrEqual: 4.19.*, status: unaffected, versionType: custom
version: 5.4.119, lessThanOrEqual: 5.4.*, status: unaffected, versionType: custom
version: 5.10.37, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.11.21, lessThanOrEqual: 5.11.*, status: unaffected, versionType: custom
version: 5.12.4, lessThanOrEqual: 5.12.*, status: unaffected, versionType: custom
version: 5.13, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
