Description

In the Linux kernel, the following vulnerability has been resolved: s390/pci: Fix potential double remove of hotplug slot In commit 6ee600bfbe0f ("s390/pci: remove hotplug slot when releasing the device") the zpci_exit_slot() was moved from zpci_device_reserved() to zpci_release_device() with the intention of keeping the hotplug slot around until the device is actually removed. Now zpci_release_device() is only called once all references are dropped. Since the zPCI subsystem only drops its reference once the device is in the reserved state it follows that zpci_release_device() must only deal with devices in the reserved state. Despite that it contains code to tear down from both configured and standby state. For the standby case this already includes the removal of the hotplug slot so would cause a double removal if a device was ever removed in either configured or standby state. Instead of causing a potential double removal in a case that should never happen explicitly WARN_ON() if a device in non-reserved state is released and get rid of the dead code cases.

Weaknesses 1

Affected Products 2

References 3

• git.kernel.org https://git.kernel.org/stable/c/371bd905599d18da62d75e3974acbf6a41e315c7
  Patch
• git.kernel.org https://git.kernel.org/stable/c/c1489651071ab1be46d2af1da8adb15c9fc3c069
  Patch
• git.kernel.org https://git.kernel.org/stable/c/c4a585e952ca403a370586d3f16e8331a7564901
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/371bd905599d18da62d75e3974acbf6a41e315c7
  Patch
• git.kernel.org https://git.kernel.org/stable/c/c1489651071ab1be46d2af1da8adb15c9fc3c069
  Patch
• git.kernel.org https://git.kernel.org/stable/c/c4a585e952ca403a370586d3f16e8331a7564901
  Patch