1 files changed, 1 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/sys/cyrus/CyrusSecurityLayer.cpp b/qpid/cpp/src/qpid/sys/cyrus/CyrusSecurityLayer.cpp
index 3d868da64b..249b769051 100644
--- a/qpid/cpp/src/qpid/sys/cyrus/CyrusSecurityLayer.cpp
+++ b/qpid/cpp/src/qpid/sys/cyrus/CyrusSecurityLayer.cpp
@@ -57,6 +57,7 @@ size_t CyrusSecurityLayer::decode(const char* input, size_t size)
             copied += count;
             decodeBuffer.position += count;
             size_t decodedSize = codec->decode(decodeBuffer.data, decodeBuffer.position);
+            if (decodedSize == 0) break;
             if (decodedSize < decodeBuffer.position) {
                 ::memmove(decodeBuffer.data, decodeBuffer.data + decodedSize, decodeBuffer.position - decodedSize);
             }