CVE-2022-49549

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> x86/MCE/AMD: Fix memory leak when threshold_create_bank() fails<br /> <br /> In mce_threshold_create_device(), if threshold_create_bank() fails, the<br /> previously allocated threshold banks array @bp will be leaked because<br /> the call to mce_threshold_remove_device() will not free it.<br /> <br /> This happens because mce_threshold_remove_device() fetches the pointer<br /> through the threshold_banks per-CPU variable but bp is written there<br /> only after the bank creation is successful, and not before, when<br /> threshold_create_bank() fails.<br /> <br /> Add a helper which unwinds all the bank creation work previously done<br /> and pass into it the previously allocated threshold banks array for<br /> freeing.<br /> <br /> [ bp: Massage. ]