From 0e835e8c0064e331a3af10bd3801a299672ce366 Mon Sep 17 00:00:00 2001
From: Lawrence Lee <45837045+Lawrence37@users.noreply.github.com>
Date: Sun, 29 Oct 2023 16:20:12 -0700
Subject: [PATCH] Fix crash in noise reduction

Fix upper bound for array access while building histogram of absolute
values in mean absolute deviation (MAD) calculation.

Fixes #6871.
---
 rtengine/FTblockDN.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rtengine/FTblockDN.cc b/rtengine/FTblockDN.cc
index 7477c5d08..278c6806f 100644
--- a/rtengine/FTblockDN.cc
+++ b/rtengine/FTblockDN.cc
@@ -2106,7 +2106,7 @@ float ImProcFunctions::Mad(const float * DataList, const int datalen)
 
     //calculate histogram of absolute values of wavelet coeffs
     for (int i = 0; i < datalen; ++i) {
-        histo[static_cast<int>(rtengine::min(32768.f, fabsf(DataList[i])))]++;
+        histo[static_cast<int>(rtengine::min(32767.f, fabsf(DataList[i])))]++;
     }
 
     //find median of histogram