Commit edc12502 for libheif

commit edc1250260ffcbaa9cf16a4158a982382d5f1348
Author: Niebelungen <dong_xr2000@163.com>
Date:   Fri Feb 27 23:06:19 2026 +0800

    Validate stsc sample coverage against stsz/stts

diff --git a/libheif/sequences/track.cc b/libheif/sequences/track.cc
index e08923bb..b825a90f 100644
--- a/libheif/sequences/track.cc
+++ b/libheif/sequences/track.cc
@@ -407,6 +407,14 @@ Error Track::load(const std::shared_ptr<Box_trak>& trak_box)
     previous_sample_description_index = sampleToChunk.sample_description_index;
   }

+  if (current_sample_idx != m_stsz->num_samples()) {
+    return {
+      heif_error_Invalid_input,
+      heif_suberror_Unspecified,
+      "Number of samples covered by 'stsc' does not match 'stsz'/'stts'."
+    };
+  }
+
   // --- read sample auxiliary information boxes

   std::vector<std::shared_ptr<Box_saiz> > saiz_boxes = stbl->get_child_boxes<Box_saiz>();