Russell A Brown created LUCENE-8720:
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Summary: Integer overflow bug in NameIntCacheLRU.makeRoomLRU()
Key: LUCENE-8720
URL: https://issues.apache.org/jira/browse/LUCENE-8720
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 7.7.1
Environment: Mac OS X 10.11.6 but this bug is not affected by the
environment because it is a straightforward integer overflow bug.
Reporter: Russell A Brown
Fix For: 7.1.1
Attachments: LUCENE-NNNN.patch
The NameIntCacheLRU.makeRoomLRU() method has an integer overflow bug because if
maxCacheSize >= Integer.MAX_VALUE, 2*maxCacheSize will overflow to -65536 and
the value of n will be negative, which will prevent any clearing of the cache
whatsoever.
Moreover, comments in NameIntCacheLRU.java and LruTaxonomyWriterCache.java
indicate that 2/3 of the cache will be cleared, whereas in fact only 1/3 of the
cache is cleared. So as not to change the behavior of the
NameIntCacheLRU.makeRoomLRU() method, I have not changed the code to clear 2/3
of the cache but instead I have changed the comments to indicate that 1/3 of
the cache is cleared.
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