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