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Fix LRUCache missing null check on destruct 

Summary:
Fix LRUCache missing null check on destruct. The check is needed if LRUCache::DisownData is called.
Closes https://github.com/facebook/rocksdb/pull/3920

Differential Revision: D8191631

Pulled By: yiwu-arbug

fbshipit-source-id: d5014f6e49b51692c18a25fb55ece935f5a023c4
This commit is contained in:
Yi Wu 2018-05-29 15:11:22 -07:00 committed by Facebook Github Bot
parent cf826de3ed
commit 724855c7da
2 changed files with 8 additions and 4 deletions
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10
cache/lru_cache.cc vendored
View File

@ -474,10 +474,13 @@ LRUCache::LRUCache(size_t capacity, int num_shard_bits,
}
LRUCache::~LRUCache() {
for (int i = 0; i < num_shards_; i++) {
shards_[i].~LRUCacheShard();
if (shards_ != nullptr) {
assert(num_shards_ > 0);
for (int i = 0; i < num_shards_; i++) {
shards_[i].~LRUCacheShard();
}
port::cacheline_aligned_free(shards_);
}
port::cacheline_aligned_free(shards_);
}
CacheShard* LRUCache::GetShard(int shard) {
@ -504,6 +507,7 @@ void LRUCache::DisownData() {
// Do not drop data if compile with ASAN to suppress leak warning.
#ifndef __SANITIZE_ADDRESS__
shards_ = nullptr;
num_shards_ = 0;
#endif // !__SANITIZE_ADDRESS__
}

2
cache/lru_cache.h vendored
View File

@ -295,7 +295,7 @@ class LRUCache : public ShardedCache {
double GetHighPriPoolRatio();
private:
LRUCacheShard* shards_;
LRUCacheShard* shards_ = nullptr;
int num_shards_ = 0;
};