From bbe4558dff509604949e1bac58152ff0836b84f3 Mon Sep 17 00:00:00 2001
From: Morgan Hardwood <bugs@londonlight.org>
Date: Sun, 18 Dec 2022 03:55:29 +0100
Subject: [PATCH] Improvement to dcraw linear_table #6448

Merged on behalf of heckflosse
https://github.com/Beep6581/RawTherapee/pull/6448#issuecomment-1081779513
---
 rtengine/dcraw.cc | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/rtengine/dcraw.cc b/rtengine/dcraw.cc
index 6ca0e4331..4ab1694b8 100644
--- a/rtengine/dcraw.cc
+++ b/rtengine/dcraw.cc
@@ -6319,12 +6319,13 @@ void CLASS parse_mos (int offset)
 
 void CLASS linear_table (unsigned len)
 {
-  int i;
-  if (len > 0x10000) len = 0x10000;
-  read_shorts (curve, len);
-  for (i=len; i < 0x10000; i++)
-    curve[i] = curve[i-1];
-  maximum = curve[0xffff];
+  const unsigned maxLen = std::min(0x10000ull, 1ull << tiff_bps);
+  len = std::min(len, maxLen);
+  read_shorts(curve, len);
+  maximum = curve[len - 1];
+  for (std::size_t i = len; i < maxLen; ++i) {
+    curve[i] = maximum;
+  }
 }
 
 void CLASS parse_kodak_ifd (int base)