CBlockedSerialInputStream::read fix

Signed-off-by: Jake Smith <[email protected]>
hpcc-systems · Jun 7, 2024 · 13194ad · 13194ad
1 parent bce418c
commit 13194ad
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/system/jlib/jstream.cpp b/system/jlib/jstream.cpp
@@ -334,7 +334,8 @@ class CBlockedSerialInputStream : public CInterfaceOf<IBufferedSerialInputStream
             // Will set endOfStream if there is no more to read - do not uncommon special case end-of-file here.
             readNextBlock();
 
-            size32_t toCopy = std::min(len, available());
+            size32_t remainingLen = len - sizeRead;
+            size32_t toCopy = std::min(remainingLen, available());
             memcpy(target + sizeRead, data(bufferOffset), toCopy);
             bufferOffset += toCopy;
             sizeRead += toCopy;