CVE-2023-54097

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

regulator: stm32-pwr: fix of_iomap leak

Smatch reports:

drivers/regulator/stm32-pwr.c:166 stm32_pwr_regulator_probe() warn:

'base' from of_iomap() not released on lines: 151,166.

In stm32_pwr_regulator_probe(), base is not released

when devm_kzalloc() fails to allocate memory or

devm_regulator_register() fails to register a new regulator device,

which may cause a leak.

To fix this issue, replace of_iomap() with

devm_platform_ioremap_resource(). devm_platform_ioremap_resource()

is a specialized function for platform devices.

It allows 'base' to be automatically released whether the probe

function succeeds or fails.

Besides, use IS_ERR(base) instead of !base

as the return value of devm_platform_ioremap_resource()

can either be a pointer to the remapped memory or

an ERR_PTR() encoded error code if the operation fails.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References