ASoC: Missing Clock Error Check in AMD ACP Machine Driver

Executive Summary

This vulnerability exists in the Linux kernel within the ASoC amd acp-mach-common component. Specifically, the functions acp_card_rt5682_init() and acp_card_rt5682s_init() did not properly check the return values of the clk_get() function when acquiring clocks.

Because these return values were not checked, invalid pointers could be dereferenced later by clock core functions, which could cause the kernel to crash.

The fix involved changing clk_get() to the device-managed devm_clk_get() and adding error checks (using IS_ERR()) immediately after each clock acquisition to prevent invalid pointer dereferencing.

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Impact Analysis

This vulnerability can lead to a kernel crash due to dereferencing invalid pointers when clock acquisition fails and the error is not properly handled.

A kernel crash can cause system instability, downtime, and potential loss of data or service availability.

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Mitigation Strategies

This vulnerability is caused by missing error checks in the Linux kernel's ASoC amd acp-mach-common driver, specifically in the acp_card_rt5682_init() and acp_card_rt5682s_init() functions.

To mitigate this vulnerability, you should update your Linux kernel to a version that includes the fix. The fix involves changing clk_get() calls to device-managed devm_clk_get() and adding IS_ERR() checks immediately after each clock acquisition to prevent kernel crashes.

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