s3: Add a paranoia check to pdb_set_plaintext_passwd()

diff --git a/source3/passdb/pdb_get_set.c b/source3/passdb/pdb_get_set.c
index 87faf2b9ba84809d69041244071df94aa2aece1f..f2e88a17fe87a5cd772f070b1b3779dea827b276 100644 (file)
--- a/source3/passdb/pdb_get_set.c
+++ b/source3/passdb/pdb_get_set.c
@@ -1035,6 +1035,11 @@ bool pdb_set_plaintext_passwd(struct samu *sampass, const char *plaintext)
         */
        pwhistory = (uchar *)pdb_get_pw_history(sampass, &current_history_len);
 
+       if ((current_history_len != 0) && (pwhistory == NULL)) {
+               DEBUG(1, ("pdb_set_plaintext_passwd: pwhistory == NULL!\n"));
+               return false;
+       }
+
        if (current_history_len < pwHistLen) {
                /*
                 * Ensure we have space for the needed history.