From ab5ad2099860bd841003a973104dc819c74357e6 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Wed, 29 May 2024 12:40:35 +0200
Subject: [server] CoW: Fix race condition generating invalid hashes

It's not too f'n bright to use a shared buffer in a multi-threaded
environment....
---
 .../src/main/java/org/openslx/bwlp/sat/fileserv/cow/CowFinalizer.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/fileserv/cow/CowFinalizer.java b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/fileserv/cow/CowFinalizer.java
index 9e4a7256..67f38634 100644
--- a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/fileserv/cow/CowFinalizer.java
+++ b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/fileserv/cow/CowFinalizer.java
@@ -77,7 +77,6 @@ public class CowFinalizer {
 	}
 
 	private void calculateHashes() throws IOException {
-		byte[] buffer = new byte[FileChunk.CHUNK_SIZE];
 		HashChecker hc = IncomingTransferBase.getHashChecker();
 		if (hc == null) {
 			LOGGER.info("No hash checker, skipping...");
@@ -96,7 +95,8 @@ public class CowFinalizer {
 				}
 			};
 			for (FileChunk chunk : chunks.getAll()) {
-				file.readFully(buffer, 0, chunk.range.getLength());
+				byte[] buffer = new byte[chunk.range.getLength()];
+				file.readFully(buffer);
 				hc.queue(chunk, buffer, cb, HashChecker.BLOCKING | HashChecker.CALC_CRC32 | HashChecker.CALC_SHA1
 						| HashChecker.NO_SLOW_WARN);
 			}
-- 
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