drm/panfrost: Job should reference MMU not file_priv

Vulnerability Description

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://git.kernel.org/stable/c/8c8e8cc91a6ffc79865108279a74fd57d9070a17
• https://git.kernel.org/stable/c/472dd7ea5e19a1aeabf1711ddc756777e05ee7c2
• https://git.kernel.org/stable/c/6e516faf04317db2c46cbec4e3b78b4653a5b109