Linux Kernel NULL Pointer Dereference Vulnerability in Rockchip HDMI PHY Runtime PM Handling

A vulnerability in the Linux kernel's handling of the Rockchip HDMI PHY can lead to a NULL pointer dereference. This issue arises because the function rk_hdptx_phy_runtime_resume() may be called before the platform_set_drvdata() function has a chance to execute during the probe phase. As a result, when dev_get_drvdata() is called, it returns a NULL value, causing a dereference error. The vulnerability has been addressed by ensuring that platform_set_drvdata() is invoked before devm_pm_runtime_enable().

Impact

Exploitation of this vulnerability can lead to a NULL pointer dereference, causing a crash or instability in the system.