1 files changed, 5 insertions, 0 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 0b2bc01f5..d1f687f9d 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -4625,6 +4625,11 @@ static int fetch_heredocs(o_string *as_string, struct pipe *pi, int heredoc_cnt,
 
                                         redir->rd_type = REDIRECT_HEREDOC2;
                                         /* redir->rd_dup is (ab)used to indicate <<- */
+                                        if (!redir->rd_filename) {
+                                                /* examples: "echo <<", "echo <<<", "echo <<>" */
+                                                syntax_error("missing here document terminator");
+                                                return -1;
+                                        }
                                         p = fetch_till_str(as_string, input,
                                                         redir->rd_filename, redir->rd_dup);
                                         if (!p) {