Merge "Split condition to prevent out of bounds access."

    }

    while (back + Entry::kPreviousLengthOffset >= front) {

        const uint8_t *prev = back - back[Entry::kPreviousLengthOffset] - Entry::kOverhead;

        const Event type = (const Event)prev[offsetof(entry, type)];

        if (prev < front

                || prev + prev[offsetof(entry, length)] + Entry::kOverhead != back

                || type <= EVENT_RESERVED || type >= EVENT_UPPER_BOUND) {

            // prev points to an out of limits or inconsistent entry

                || prev + prev[offsetof(entry, length)] + Entry::kOverhead != back) {

            // prev points to an out of limits entry

            return nullptr;

        }

        const Event type = (const Event)prev[offsetof(entry, type)];

        if (type <= EVENT_RESERVED || type >= EVENT_UPPER_BOUND) {

            // prev points to an inconsistent entry

            return nullptr;

        }

        // if invalidTypes does not contain the type, then the type is valid.