enforce valid TAG+= names

diff --git a/udev/udev-rules.c b/udev/udev-rules.c
index 56a258d8adb920638ccd511f4ec5b1579f697215..d16c1f9454d322fa9ec25ee4317653fe894f9e9d 100644 (file)
--- a/udev/udev-rules.c
+++ b/udev/udev-rules.c
@@ -2528,10 +2528,20 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                }
                case TK_A_TAG: {
                        char tag[UTIL_PATH_SIZE];
+                       const char *p;
 
                        udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
                        if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
                                udev_device_cleanup_tags_list(event->dev);
+                       for (p = tag; *p != '\0'; p++) {
+                               if ((*p >= 'a' && *p <= 'z') ||
+                                   (*p >= 'A' && *p <= 'Z') ||
+                                   (*p >= '0' && *p <= '9') ||
+                                   *p == '-' || *p == '_')
+                                       continue;
+                               err(event->udev, "ignoring invalid tag name '%s'\n", tag);
+                               break;
+                       }
                        udev_device_add_tag(event->dev, tag);
                        break;
                }