Don't crash on a missing Subject in index.txt

An index.txt entry which has an empty Subject name field will cause ca
to crash. Therefore check it when we load it to make sure its not empty.

Fixes #5109

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5114)

diff --git a/apps/ca.c b/apps/ca.c
index 551d0aa2f8c3b2d2bf3ab01caaecdff880634bd3..9b1d9bdaac8f9003695e788ad1c5632b6493dace 100644 (file)
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -663,6 +663,10 @@ end_of_options:
                 goto end;
             }
         }
+        if (pp[DB_name][0] == '\0') {
+            BIO_printf(bio_err, "entry %d: bad Subject\n", i + 1);
+            goto end;
+        }
     }
     if (verbose) {
         TXT_DB_write(bio_out, db->db);