Fix undefined behaviour in x509
diff --git a/ChangeLog b/ChangeLog
index c420393..7e7374b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -33,6 +33,8 @@
      errors on use of deprecated functions.
 
 Bugfix
+   * Fix undefined behaviour (memcmp( NULL, NULL, 0 );) in X.509 modules
+     (detected by Clang's 3.6 UBSan).
    * mpi_size() and mpi_msb() would segfault when called on an mpi that is
      initialized but not set (found by pravic).
    * Fix detection of support for getrandom() on Linux (reported by syzzer) by