From aeb2988eec051146a89d35d007dda1d076c722ba Mon Sep 17 00:00:00 2001
From: Mirco Miranda <mirco.miranda@systemceramics.com>
Date: Thu, 23 Oct 2025 11:59:39 +0200
Subject: [PATCH] Fix possible infinite loop when reading a broken jp2

---
 src/imageformats/jp2.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/imageformats/jp2.cpp b/src/imageformats/jp2.cpp
index 3b3e61c..cd92cb1 100644
--- a/src/imageformats/jp2.cpp
+++ b/src/imageformats/jp2.cpp
@@ -73,7 +73,7 @@ static void info_callback(const char *msg, void *client_data)
 static OPJ_SIZE_T jp2_read(void *p_buffer, OPJ_SIZE_T p_nb_bytes, void *p_user_data)
 {
     auto dev = (QIODevice*)p_user_data;
-    if (dev == nullptr) {
+    if (dev == nullptr || dev->atEnd()) {
         return OPJ_SIZE_T(-1);
     }
     return OPJ_SIZE_T(dev->read((char*)p_buffer, (qint64)p_nb_bytes));