UBUNTU-CVE-2022-49359

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UBUNTU-CVE-2022-49359

Summary:

Details: In the Linux kernel, the following vulnerability has been resolved: drm/panfrost: Job should reference MMU not file_priv For a while now it's been allowed for a MMU context to outlive it's corresponding panfrost_priv, however the job structure still references panfrost_priv to get hold of the MMU context. If panfrost_priv has been freed this is a use-after-free which I've been able to trigger resulting in a splat. To fix this, drop the reference to panfrost_priv in the job structure and add a direct reference to the MMU structure which is what's actually needed.

References: https://ubuntu.com/security/CVE-2022-49359, https://www.cve.org/CVERecord?id=CVE-2022-49359, https://git.kernel.org/linus/6e516faf04317db2c46cbec4e3b78b4653a5b109, https://git.kernel.org/stable/c/472dd7ea5e19a1aeabf1711ddc756777e05ee7c2, https://git.kernel.org/stable/c/6e516faf04317db2c46cbec4e3b78b4653a5b109, https://git.kernel.org/stable/c/8c8e8cc91a6ffc79865108279a74fd57d9070a17, https://ubuntu.com/security/notices/USN-8962-1, https://ubuntu.com/security/notices/USN-8961-1, https://ubuntu.com/security/notices/USN-8963-1