1 files changed, 2 insertions, 0 deletions
diff --git a/posix/regcomp.c b/posix/regcomp.c
index 076eca3e7c..8f2747b3c9 100644
--- a/posix/regcomp.c
+++ b/posix/regcomp.c
@@ -2582,6 +2582,8 @@ parse_dup_op (bin_tree_t *elem, re_string_t *regexp, re_dfa_t *dfa,
 
       /* Duplicate ELEM before it is marked optional.  */
       elem = duplicate_tree (elem, dfa);
+      if (BE (elem == NULL, 0))
+        goto parse_dup_op_espace;
       old_tree = tree;
     }
   else