It seems to me that SA_cache::sets should have type LRU rather than LRU . As Jamey pointed out, what you have posted here won't compile cleanly otherwise. The rest of this answer assumes that type is LRU .
Since the type of cache->sets is LRU **, the type of cache->sets + I is also LRU **. When you assign the result to LRU *cur_lru, I'd have expected you to get a compiler warning. (Are you building without warnings enabled?).
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