From 478b20d9234d6f856cbb4a2a67ee858dc99293d5 Mon Sep 17 00:00:00 2001
From: headshog <craaaaaachind@gmail.com>
Date: Wed, 6 Dec 2023 17:57:41 +0300
Subject: [PATCH] opj_t1_ht_decode_cblk(): avoid memcpy() with 0-input size and
 nullptr destination. fix ht_dec.c:1215 (#1492)

---
 src/lib/openjp2/ht_dec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/lib/openjp2/ht_dec.c b/src/lib/openjp2/ht_dec.c
index 120d7e49a..9ea061f37 100644
--- a/src/lib/openjp2/ht_dec.c
+++ b/src/lib/openjp2/ht_dec.c
@@ -1210,6 +1210,9 @@ OPJ_BOOL opj_t1_ht_decode_cblk(opj_t1_t *t1,
 
         /* Concatenate all chunks */
         cblkdata = t1->cblkdatabuffer;
+        if (cblkdata == NULL) {
+            return OPJ_FALSE;
+        }
         cblk_len = 0;
         for (i = 0; i < cblk->numchunks; i++) {
             memcpy(cblkdata + cblk_len, cblk->chunks[i].data, cblk->chunks[i].len);