drm/mediatek: Clean dangling pointer on bind error path

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Clean dangling pointer on bind error path mtk_drm_bind() can fail, in which case drm_dev_put() is called, destroying the drm_device object. However a pointer to it was still being held in the private object, and that pointer would be passed along to DRM in mtk_drm_sys_prepare() if a suspend were triggered at that point, resulting in a panic. Clean the pointer when destroying the object in the error path to prevent this from happening.

References

• https://git.kernel.org/stable/c/9a48f99aa7bea15e0b1d8b0040c46b4792eddf3b
• https://git.kernel.org/stable/c/a161f1d92aabb3b8463f752bdc3474dc3a5ec0e5
• https://git.kernel.org/stable/c/6a89ddee1686a8872384aaa9f0bcfa6b675acd86
• https://git.kernel.org/stable/c/49cf87919daeeeeeb9e924c39bdd9203af434461
• https://git.kernel.org/stable/c/7b551a501fa714890e55bae73efede1185728d72
• https://git.kernel.org/stable/c/f3887c771576c5d740c5c5b8bf654a8ab8020b7d
• https://git.kernel.org/stable/c/36aa8c61af55675ed967900fbe5deb32d776f051