Order import: Catch CSV parsing errors during iteration (PRETIXEU-9AW)

src/pretix/control/views/orderimport.py

@@ -32,6 +32,7 @@
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations under the License.
 
+import csv
 import logging
 from datetime import timedelta
 
@@ -146,16 +147,24 @@ class ProcessView(EventPermissionRequiredMixin, AsyncAction, FormView):
         else:
             charset = None
         try:
-            return parse_csv(self.file.file, 1024 * 1024, charset=charset)
-        except UnicodeDecodeError:
-            messages.warning(
-                self.request,
-                _(
-                    "We could not identify the character encoding of the CSV file. "
-                    "Some characters were replaced with a placeholder."
+            try:
+                c = parse_csv(self.file.file, 1024 * 1024, charset=charset)
+                if c is not None:
+                    return list(c)
+            except UnicodeDecodeError:
+                messages.warning(
+                    self.request,
+                    _(
+                        "We could not identify the character encoding of the CSV file. "
+                        "Some characters were replaced with a placeholder."
+                    )
                 )
-            )
-            return parse_csv(self.file.file, 1024 * 1024, "replace", charset=charset)
+                c = parse_csv(self.file.file, 1024 * 1024, "replace", charset=charset)
+                if c is not None:
+                    return list(c)
+        except csv.Error:
+            logger.exception("Could not parse CSV file")
+            return None
 
     def get(self, request, *args, **kwargs):
         if 'async_id' in request.GET and settings.HAS_CELERY:
@@ -193,5 +202,5 @@ class ProcessView(EventPermissionRequiredMixin, AsyncAction, FormView):
         ctx = super().get_context_data(**kwargs)
         ctx['file'] = self.file
         ctx['parsed'] = self.parsed
-        ctx['sample_rows'] = list(self.parsed)[:3]
+        ctx['sample_rows'] = self.parsed[:3]
         return ctx