At conditional (1): "filter == NULL" taking the true branch.
Comparing "filter" to null implies that "filter" might be null.
  237    if (filter == NULL) {
  238        /* It's okay if this is NULL. In that case we will simply act
  239         * like the 'deny' provider.
  240         */
At conditional (2): "0 <= debug_level" taking the true branch.
At conditional (3): "debug_timestamps" taking the true branch.
  241        DEBUG(0, ("Warning: access_provider=ldap set, "
  242                  "but no ldap_access_filter configured. "
  243                  "All domain users will be denied access.\n"));
  244    }
  245
Dereferencing null variable "filter".
  246    if (filter[0] == '(') {
  247        /* This filter is wrapped in parentheses.
  248         * Pass it as-is to the openldap libraries.
  249         */
  250        access_ctx->filter = filter;
  251    }
  252    else {
  253        /* Add parentheses around the filter */
  254        access_ctx->filter = talloc_asprintf(access_ctx, "(%s)", filter);
  255        if (access_ctx->filter == NULL) {
  256            ret = ENOMEM;
  257            goto done;
  258        }
  259    }