CVE-2022-49098

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Drivers: hv: vmbus: Fix potential crash on module unload<br /> <br /> The vmbus driver relies on the panic notifier infrastructure to perform<br /> some operations when a panic event is detected. Since vmbus can be built<br /> as module, it is required that the driver handles both registering and<br /> unregistering such panic notifier callback.<br /> <br /> After commit 74347a99e73a ("x86/Hyper-V: Unload vmbus channel in hv panic callback")<br /> though, the panic notifier registration is done unconditionally in the module<br /> initialization routine whereas the unregistering procedure is conditionally<br /> guarded and executes only if HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE capability<br /> is set.<br /> <br /> This patch fixes that by unconditionally unregistering the panic notifier<br /> in the module&amp;#39;s exit routine as well.