From 4c7931869490c3c662b1e548c4c22bd9ee7b52fb Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Sat, 19 Mar 2022 06:52:47 +0000
Subject: [PATCH] dnn: fix index access

---
 modules/dnn/src/dnn.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/modules/dnn/src/dnn.cpp b/modules/dnn/src/dnn.cpp
index cbebad7e7c..b4fa8933c3 100644
--- a/modules/dnn/src/dnn.cpp
+++ b/modules/dnn/src/dnn.cpp
@@ -2759,8 +2759,12 @@ struct Net::Impl : public detail::NetImplBase
                         it->second.out.empty())
                 {
                     getLayerShapesRecursively(layerId, inOutShapes);
+                    it = inOutShapes.find(layerId);
+                    CV_Assert(it != inOutShapes.end());
                 }
-                const MatShape& shape = inOutShapes[layerId].out[inputLayerIds[i].oid];
+                const int out_port = inputLayerIds[i].oid;
+                CV_CheckLT(out_port, (int)it->second.out.size(), "");
+                const MatShape& shape = it->second.out[out_port];
                 layerShapes.in.push_back(shape);
             }
         }