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

mm/compaction: fix UBSAN shift-out-of-bounds warning

syzkaller reported a UBSAN shift-out-of-bounds warning of (1UL << order)
in isolate_freepages_block().  The bogus compound_order can be any value
because it is union with flags.  Add back the MAX_PAGE_ORDER check to fix
the warning.