drm/msm/dpu: Fix error pointers in dpu_plane_virtual_atomic_check

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/msm/dpu: Fix error pointers in dpu_plane_virtual_atomic_check The function dpu_plane_virtual_atomic_check was dereferencing pointers returned by drm_atomic_get_plane_state without checking for errors. This could lead to undefined behavior if the function returns an error pointer. This commit adds checks using IS_ERR to ensure that plane_state is valid before dereferencing them. Similar to commit da29abe71e16 ("drm/amd/display: Fix error pointers in amdgpu_dm_crtc_mem_type_changed"). Patchwork: https://patchwork.freedesktop.org/patch/643132/

References

• https://git.kernel.org/stable/c/a9670ed1cce3216778c89936d3ae91cf0d436035
• https://git.kernel.org/stable/c/5cb1b130e1cd04239cc9c26a98279f4660dce583