drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req()

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Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that stems from the drm/dpmst module not properly checking the validity of the mstprimary pointer when processing an MST up...