IVGCVSW-6798 ArmNN driver profiling crashing

* Prevent a call to ExtractJsonObjects with an invalid value of
  parentObject.

Signed-off-by: Colm Donelan <colm.donelan@arm.com>
Change-Id: I279489c9ac3a954786f51bc90fb428db437cb2df

1 files changed, 8 insertions, 4 deletions

diff --git a/src/armnn/Profiling.cpp b/src/armnn/Profiling.cpp
index e18bf475d1..805b61e8ef 100644
--- a/src/armnn/Profiling.cpp
+++ b/src/armnn/Profiling.cpp
@@ -345,10 +345,14 @@ void ExtractJsonObjects(unsigned int inferenceIndex,
                 parentObject.AddChild(childObject);
             }
 
-            // Recursively process children. In reality this won't be very deep recursion. ~4-6 levels deep.
-            ExtractJsonObjects(inferenceIndex, childEvent, parentObject.GetChild(childIdx), descendantsMap);
-
-            childIdx++;
+            // It's possible that childIdx can overrun the parents' child vector. Check before we try to process a
+            // non-existent child.
+            if (childIdx < parentObject.NumChildren())
+            {
+                // Recursively process children.
+                ExtractJsonObjects(inferenceIndex, childEvent, parentObject.GetChild(childIdx), descendantsMap);
+                childIdx++;
+            }
         }
     }
 }