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prevent nullptr dereference in table reader error case

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Summary:
A user encountered segfault on the call to `CacheDependencies()`, probably because `NewIndexIterator()` failed before populating `*index_entry`. Let's avoid the call in that case.
Closes https://github.com/facebook/rocksdb/pull/2939

Differential Revision: D5928611

Pulled By: ajkr

fbshipit-source-id: 484be453dbb00e5e160e9c6a1bc933df7d80f574
This commit is contained in:
Andrew Kryczka 2017-09-27 23:57:07 -07:00 committed by Facebook Github Bot
parent 6a541afcc4
commit c2f6e45aa3
1 changed files with 11 additions and 7 deletions
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8
table/block_based_table_reader.cc
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@ -813,15 +813,19 @@ Status BlockBasedTable::Open(const ImmutableCFOptions& ioptions,
CachableEntry<IndexReader> index_entry;
unique_ptr<InternalIterator> iter(
new_table->NewIndexIterator(ReadOptions(), nullptr, &index_entry));
s = iter->status();
if (s.ok()) {
// This is the first call to NewIndexIterator() since we're in Open().
// On success it should give us ownership of the `CachableEntry` by
// populating `index_entry`.
assert(index_entry.value != nullptr);
index_entry.value->CacheDependencies(pin);
if (pin) {
rep->index_entry = std::move(index_entry);
} else {
index_entry.Release(table_options.block_cache.get());
}
s = iter->status();
if (s.ok()) {
// Hack: Call GetFilter() to implicitly add filter to the block_cache
auto filter_entry = new_table->GetFilter();
if (filter_entry.value != nullptr) {