From 7304a4bb783c8e37d01cd796915f48d09b55b0ee Mon Sep 17 00:00:00 2001
From: Povilas Kanapickas <povilas@radix.lt>
Date: Wed, 15 Apr 2020 00:15:10 +0300
Subject: [PATCH] genesys: Fix out of bounds access during calibration on gl843

---
 backend/genesys/gl843.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backend/genesys/gl843.cpp b/backend/genesys/gl843.cpp
index a80017998..2329b7288 100644
--- a/backend/genesys/gl843.cpp
+++ b/backend/genesys/gl843.cpp
@@ -2005,6 +2005,9 @@ void CommandSetGl843::send_shading_data(Genesys_Device* dev, const Genesys_Senso
         length -= (-offset);
         offset = 0;
     }
+    if (static_cast<int>(length) + offset > static_cast<int>(size)) {
+        length = size - offset;
+    }
 
   /* loop over calibration data */
   for (i = 0; i < length; i++)