From 2abea46a87743f076759843136d7e3af3015b670 Mon Sep 17 00:00:00 2001
From: XMRig <support@xmrig.com>
Date: Sun, 10 Nov 2019 22:05:52 +0700
Subject: [PATCH] #1273 Fixed crash when use "GET /2/backends" API endpoint
 with disabled CUDA.

---
 src/backend/cuda/CudaBackend.cpp    | 24 +++++++++++++-----------
 src/backend/cuda/wrappers/CudaLib.h |  5 +++--
 2 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/src/backend/cuda/CudaBackend.cpp b/src/backend/cuda/CudaBackend.cpp
index feb1dd93..812ee270 100644
--- a/src/backend/cuda/CudaBackend.cpp
+++ b/src/backend/cuda/CudaBackend.cpp
@@ -474,19 +474,21 @@ rapidjson::Value xmrig::CudaBackend::toJSON(rapidjson::Document &doc) const
     out.AddMember("algo",       d_ptr->algo.toJSON(), allocator);
     out.AddMember("profile",    profileName().toJSON(), allocator);
 
-    Value versions(kObjectType);
-    versions.AddMember("cuda-runtime",   Value(CudaLib::version(d_ptr->runtimeVersion).c_str(), allocator), allocator);
-    versions.AddMember("cuda-driver",    Value(CudaLib::version(d_ptr->driverVersion).c_str(), allocator), allocator);
-    versions.AddMember("plugin",         String(CudaLib::pluginVersion()).toJSON(doc), allocator);
+    if (CudaLib::isReady()) {
+        Value versions(kObjectType);
+        versions.AddMember("cuda-runtime",   Value(CudaLib::version(d_ptr->runtimeVersion).c_str(), allocator), allocator);
+        versions.AddMember("cuda-driver",    Value(CudaLib::version(d_ptr->driverVersion).c_str(), allocator), allocator);
+        versions.AddMember("plugin",         String(CudaLib::pluginVersion()).toJSON(doc), allocator);
 
-#   ifdef XMRIG_FEATURE_NVML
-    if (NvmlLib::isReady()) {
-        versions.AddMember("nvml",       StringRef(NvmlLib::version()), allocator);
-        versions.AddMember("driver",     StringRef(NvmlLib::driverVersion()), allocator);
+#       ifdef XMRIG_FEATURE_NVML
+        if (NvmlLib::isReady()) {
+            versions.AddMember("nvml",       StringRef(NvmlLib::version()), allocator);
+            versions.AddMember("driver",     StringRef(NvmlLib::driverVersion()), allocator);
+        }
+#       endif
+
+        out.AddMember("versions", versions, allocator);
     }
-#   endif
-
-    out.AddMember("versions", versions, allocator);
 
     if (d_ptr->threads.empty() || !hashrate()) {
         return out;
diff --git a/src/backend/cuda/wrappers/CudaLib.h b/src/backend/cuda/wrappers/CudaLib.h
index 10ef24fe..f18ed350 100644
--- a/src/backend/cuda/wrappers/CudaLib.h
+++ b/src/backend/cuda/wrappers/CudaLib.h
@@ -69,8 +69,9 @@ public:
     static const char *lastError() noexcept;
     static void close();
 
-    static inline bool isInitialized()   { return m_initialized; }
-    static inline const String &loader() { return m_loader; }
+    static inline bool isInitialized()    { return m_initialized; }
+    static inline bool isReady() noexcept { return m_ready; }
+    static inline const String &loader()  { return m_loader; }
 
     static bool cnHash(nvid_ctx *ctx, uint32_t startNonce, uint64_t height, uint64_t target, uint32_t *rescount, uint32_t *resnonce);
     static bool deviceInit(nvid_ctx *ctx) noexcept;