In the Linux kernel, the following vulnerability has been resolved: usb: musb: sunxi: Fix accessing an released usb phy Commit 6ed05c68cbca ("usb: musb: sunxi: Explicitly release USB PHY on exit") will cause that usb phy @glue->xceiv is accessed after released. 1) register platform driver @sunximusbdriver // get the usb phy @glue->xceiv sunximusbprobe() -> devmusbgetphy(). 2) register and unregister platform driver @musbdriver musbprobe() -> sunximusbinit() use the phy here //the phy is released here musbremove() -> sunximusbexit() -> devmusbputphy() 3) register @musbdriver again musbprobe() -> sunximusbinit() use the phy here but the phy has been released at 2). ... Fixed by reverting the commit, namely, removing devmusbputphy() from sunximusbexit().
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