cuckoocache: Check for uint32 overflow in setup_bytes

This fixes an potential overflow which existed prior to this patchset.

If CuckooCache::cache<Element, Hash>::setup_bytes is called with a
`size_t bytes` which, when divided by sizeof(Element), does not fit into
an uint32_t, the implicit conversion to uint32_t in the call to setup
will result in an overflow.

At least on x86_64, this overflow is possible:

static_assert(std::numeric_limits<size_t>::max() / 32 <= std::numeric_limits<uint32_t>::max());
static_assert(std::numeric_limits<size_t>::max() / 4 <= std::numeric_limits<uint32_t>::max());

This commit detects such cases and signals to callers that the `size_t
bytes` input is too large.

0 files changed, 0 insertions, 0 deletions