Fix crash with invalid vtable info when processing MSVC vftables

Found when a vtable is constrained to a size less than the base vft, indicating a bad base vft associating most likely.

Fixes https://github.com/Vector35/binaryninja-api/issues/6840

1 files changed, 2 insertions, 2 deletions

diff --git a/plugins/rtti/microsoft.cpp b/plugins/rtti/microsoft.cpp
index 9e26194a..b1b549a8 100644
--- a/plugins/rtti/microsoft.cpp
+++ b/plugins/rtti/microsoft.cpp
@@ -790,8 +790,8 @@ void MicrosoftRTTIProcessor::ProcessVFT()
         }
 
         vftFinished.insert(vftAddr);
-        auto vftInfo = ProcessVFT(vftAddr, classInfo, baseClassInfo);
-        classInfo.vft = vftInfo.value();
+        if (auto vftInfo = ProcessVFT(vftAddr, classInfo, baseClassInfo))
+            classInfo.vft = vftInfo.value();
     };
 
     size_t processedNum = 0;