From 4241ae6fbbf1de9658764a80944dc8108f2b4154 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Tue, 15 Aug 2017 11:55:58 +0200
Subject: [PATCH] Fix assertion in debug mode / heap-based buffer overflow in
 opj_write_bytes_LE for Cinema profiles with numresolutions = 1 (#985)

---
 src/lib/openjp2/j2k.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/lib/openjp2/j2k.c b/src/lib/openjp2/j2k.c
index a2521ebbc..54b490a8c 100644
--- a/src/lib/openjp2/j2k.c
+++ b/src/lib/openjp2/j2k.c
@@ -6573,10 +6573,16 @@ static void opj_j2k_set_cinema_parameters(opj_cparameters_t *parameters,
 
     /* Precincts */
     parameters->csty |= 0x01;
-    parameters->res_spec = parameters->numresolution - 1;
-    for (i = 0; i < parameters->res_spec; i++) {
-        parameters->prcw_init[i] = 256;
-        parameters->prch_init[i] = 256;
+    if (parameters->numresolution == 1) {
+        parameters->res_spec = 1;
+        parameters->prcw_init[0] = 128;
+        parameters->prch_init[0] = 128;
+    } else {
+        parameters->res_spec = parameters->numresolution - 1;
+        for (i = 0; i < parameters->res_spec; i++) {
+            parameters->prcw_init[i] = 256;
+            parameters->prch_init[i] = 256;
+        }
     }
 
     /* The progression order shall be CPRL */