Vulnerability CVE-2024-38390
Published: 2024-06-21

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

drm/msm/a6xx: Avoid a nullptr dereference when speedbin setting fails

Calling a6xx_destroy() before adreno_gpu_init() leads to a null pointer
dereference on:

msm_gpu_cleanup() : platform_set_drvdata(gpu->pdev, NULL);

as gpu->pdev is only assigned in:

a6xx_gpu_init()
|_ adreno_gpu_init
|_ msm_gpu_init()

Instead of relying on handwavy null checks down the cleanup chain,
explicitly de-allocate the LLC data and free a6xx_gpu instead.

Patchwork: https://patchwork.freedesktop.org/patch/588919/

 References:
https://git.kernel.org/stable/c/247849eeb3fd88f8990ed73e33af70d5c10f9aec
https://git.kernel.org/stable/c/a1955a6df91355fef72a3a254700acd3cc1fec0d
https://git.kernel.org/stable/c/617e3d1680504a3f9d88e1582892c68be155498f
https://git.kernel.org/stable/c/46d4efcccc688cbacdd70a238bedca510acaa8e4
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