[LUCENENET-609] Lucene.Net.Support.IO.FileSupport::fileCanonPathCache is not thread safe

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: Lucene.Net 4.8.0
• Component/s: Lucene.Net Core
• Labels: easyfix

Environment

Windows (any version)

• Flags: Patch
• Assignee: Shad Storhaug
• Reporter: Thomas Mathew
• Created: 07/Jun/19 00:24
• Updated: 10/Jul/19 12:42
• Resolved: 10/Jul/19 12:42

Description

Lucene.Net.Support.IO.FileSupport is a static class with a normal dictionary used as a cache. If called concurrently multiple times (enough to force the dictionary to resize), concurrent calls will fail with an IndexOutOfRangeException

private static readonly IDictionary<string, string> fileCanonPathCache = new Dictionary<string, string>();