Description: bpf: Fix integer overflow in prealloc_elems_and_freelist()
References:
 https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=30e29a9a2bc6a4888335a6ede968b75cd329657a
 https://lore.kernel.org/bpf/728b238e-a481-eb50-98e9-b0f430ab01e7@gmail.com/
Notes:
 carnil> Commit fixes 557c0c6e7df8 ("bpf: convert stackmap to pre-
 carnil> allocation").
 carnil> Fixed as well in 5.14.12 in the 5.14.y series.
Bugs:
upstream: released (5.15-rc5) [30e29a9a2bc6a4888335a6ede968b75cd329657a]
5.10-upstream-stable: released (5.10.73) [064faa8e8a9b50f5010c5aa5740e06d477677a89]
4.19-upstream-stable: released (4.19.211) [078cdd572408176a3900a6eb5a403db0da22f8e0]
4.9-upstream-stable: released (4.9.287) [4fd6663eb01bc3c73143cd27fefd7b8351bc6aa6]
sid: released (5.14.12-1)
5.10-bullseye-security: released (5.10.84-1)
4.19-buster-security: released (4.19.232-1)
4.9-stretch-security: released (4.9.290-1)