Executive Summary

This vulnerability is a double free issue in the Linux kernel's amlogic-a4 RTC driver. The problem occurs because the clock resource obtained via devm_clk_get_enabled() is automatically managed by the device resource management framework (devres), which disables and frees the clock on driver detach. However, the driver manually calls clk_disable_unprepare() in error paths and the remove function, leading to the clock being freed twice. The fix removes these redundant manual calls, allowing devres to manage the clock lifecycle properly.

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Impact Analysis

This double free vulnerability can cause system instability or crashes due to improper resource management in the kernel driver. Double freeing memory or resources can lead to undefined behavior, including kernel panics or potential security risks such as denial of service.

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Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version where the redundant clk_disable_unprepare() calls have been removed from the probe error path and aml_rtc_remove() function, allowing the devm framework to manage the clock lifecycle automatically.

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