mm/vmalloc: do not trigger BUG() on BH disabled context

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

mm/vmalloc: do not trigger BUG() on BH disabled context

__get_vm_area_node() currently triggers a BUG() if in_interrupt() returns

true. However, in_interrupt() also reports true when BH are disabled.

The bridge code can call rhashtable_lookup_insert_fast() with bottom

halves disabled:

__vlan_add()

-> br_fdb_add_local()

spin_lock_bh(&br->hash_lock); <-- Disable BH

-> fdb_add_local()

-> fdb_create()

-> rhashtable_lookup_insert_fast()

-> kvmalloc()

-> vmalloc()

-> __get_vm_area_node()

-> BUG_ON(in_interrupt())

spin_unlock_bh(&br->hash_lock)

this triggers the BUG() despite the caller not being in NMI or

hard IRQ context.

Replace the in_interrupt() check with in_nmi() || in_hardirq().