CVE-2021-47295

In the Linux kernel, the following vulnerability has been resolved: net:
sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported
memory leak in tcindex_set_parms(). The problem was in non-freed perfect
hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new
tcindex_data is allocated and some fields from old one are copied to new
one, but not the perfect hash. Since tcindex_partial_destroy_work() is the
destroy function for old tcindex_data, we need to free perfect hash to
avoid memory leak.