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Change History

In the Linux kernel, the following vulnerability has been resolved:

usb: core: Prevent null pointer dereference in update_port_device_state

Currently, the function update_port_device_state gets the usb_hub from
udev->parent by calling usb_hub_to_struct_hub.
However, in case the actconfig or the maxchild is 0, the usb_hub would
be NULL and upon further accessing to get port_dev would result in null
pointer dereference.

Fix this by introducing an if check after the usb_hub is populated.

kernel.org https://git.kernel.org/stable/c/12783c0b9e2c7915a50d5ec829630ff2da50472c [No types assigned]

kernel.org https://git.kernel.org/stable/c/465b545d1d7ef282192ddd4439b08279bdb13f6f [No types assigned]

kernel.org https://git.kernel.org/stable/c/ed85777c640cf9e6920bb1b60ed8cd48e1f4d873 [No types assigned]