fix: allow 50 MP smartphone photos in bulk image upload

NetBox sets Pillow's MAX_IMAGE_PIXELS to 25 MP, so Pillow rejects images
above 50 MP as decompression bombs. Raise the limit to 100 MP while the
bulk upload is processed and surface the underlying Pillow error.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

netbox_utilities/views.py

@@ -1,3 +1,6 @@
+from contextlib import contextmanager
+from io import BytesIO
+
 from dcim.models import Device, Module, Rack
 from django.contrib import messages
 from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
@@ -50,6 +53,24 @@ def _safe_return_url(request, default_name="home"):
     return reverse(default_name)
 
 
+# NetBox limits Pillow to 25 MP (bomb error above 50 MP), which rejects
+# current 50 MP smartphone photos such as Google Pixel images (8160x6144).
+BULK_IMAGE_MAX_PIXELS = 100_000_000
+
+
+@contextmanager
+def raised_image_pixel_limit():
+    from PIL import Image
+
+    original_limit = Image.MAX_IMAGE_PIXELS
+    if original_limit is not None and original_limit < BULK_IMAGE_MAX_PIXELS:
+        Image.MAX_IMAGE_PIXELS = BULK_IMAGE_MAX_PIXELS
+    try:
+        yield
+    finally:
+        Image.MAX_IMAGE_PIXELS = original_limit
+
+
 class BulkImageUploadView(ContentTypePermissionRequiredMixin, View):
     template_name = "netbox_utilities/bulk_image_upload.html"
 
@@ -65,31 +86,41 @@ class BulkImageUploadView(ContentTypePermissionRequiredMixin, View):
         parent = self._get_parent(request, request.POST)
         form = BulkImageUploadForm(request.POST, request.FILES)
         if form.is_valid():
-            image_forms = self._build_image_forms(parent, form.cleaned_data)
-            invalid = [image_form for image_form in image_forms if not image_form.is_valid()]
-            if invalid:
-                for image_form in invalid:
-                    filename = getattr(image_form.files.get("image"), "name", "Bild")
-                    for errors in image_form.errors.values():
-                        for error in errors:
-                            form.add_error("images", f"{filename}: {error}")
-            else:
-                created = []
-                try:
-                    with transaction.atomic():
-                        for image_form in image_forms:
-                            created.append(image_form.save())
-                except (DatabaseError, OSError, SuspiciousFileOperation, ValidationError, ValueError) as error:
+            with raised_image_pixel_limit():
+                return self._process_upload(request, form, parent)
+        return self._render(request, form, parent)
+
+    def _process_upload(self, request, form, parent):
+        image_forms = self._build_image_forms(parent, form.cleaned_data)
+        invalid = [image_form for image_form in image_forms if not image_form.is_valid()]
+        if invalid:
+            for image_form in invalid:
+                image = image_form.files.get("image")
+                reason = self._image_error_reason(image)
+                if reason:
+                    form.add_error("images", f"{getattr(image, 'name', 'Bild')}: Pillow meldet: {reason}")
+            for image_form in invalid:
+                filename = getattr(image_form.files.get("image"), "name", "Bild")
+                for errors in image_form.errors.values():
+                    for error in errors:
+                        form.add_error("images", f"{filename}: {error}")
+        else:
+            created = []
+            try:
+                with transaction.atomic():
                     for image_form in image_forms:
-                        image_file = image_form.instance.image
-                        if image_file.name and image_file._committed:
-                            image_file.delete(save=False)
-                    form.add_error("images", f"Die Bilder konnten nicht gespeichert werden: {error}")
-                else:
-                    count = len(created)
-                    noun = "Bild wurde" if count == 1 else "Bilder wurden"
-                    messages.success(request, f"{count} {noun} gleichzeitig hochgeladen.")
-                    return redirect(self._return_url(request, parent))
+                        created.append(image_form.save())
+            except (DatabaseError, OSError, SuspiciousFileOperation, ValidationError, ValueError) as error:
+                for image_form in image_forms:
+                    image_file = image_form.instance.image
+                    if image_file.name and image_file._committed:
+                        image_file.delete(save=False)
+                form.add_error("images", f"Die Bilder konnten nicht gespeichert werden: {error}")
+            else:
+                count = len(created)
+                noun = "Bild wurde" if count == 1 else "Bilder wurden"
+                messages.success(request, f"{count} {noun} gleichzeitig hochgeladen.")
+                return redirect(self._return_url(request, parent))
         return self._render(request, form, parent)
 
     @staticmethod
@@ -109,6 +140,26 @@ class BulkImageUploadView(ContentTypePermissionRequiredMixin, View):
             queryset = queryset.restrict(request.user, "view")
         return get_object_or_404(queryset, pk=object_id)
 
+    @staticmethod
+    def _image_error_reason(image):
+        """Return the underlying Pillow error, which Django hides behind a generic message."""
+        from PIL import Image
+
+        try:
+            if hasattr(image, "temporary_file_path"):
+                source = image.temporary_file_path()
+            else:
+                image.seek(0)
+                source = BytesIO(image.read())
+            with Image.open(source) as opened:
+                opened.verify()
+        except Exception as error:  # noqa: BLE001 - surface any Pillow failure
+            return f"{type(error).__name__}: {error}"
+        finally:
+            if hasattr(image, "seek"):
+                image.seek(0)
+        return None
+
     @staticmethod
     def _build_image_forms(parent, cleaned_data):
         image_forms = []