From 49291b79c54f9e199d14d195d0beb2dbcdce7bdb Mon Sep 17 00:00:00 2001
From: Mark Reynolds <mreynolds@redhat.com>
Date: Jan 29 2018 17:53:54 +0000
Subject: Ticket 49370 - Crash when using a global and local pw

 policies

Description:  This a regression from the previous patch.  We were
              accidently using a reference to the global pw policy
              password storage scheme, which was getting freed after
              pblock was done from an operation.  The next operation
              then used(and double freed) this memory on the next
              operation.

https://pagure.io/389-ds-base/issue/49370

Reviewed by: tbordaz (Thanks!)

(cherry picked from commit d86e0f9634e694feb378ee335d29b2e89fd27e2c)

---

diff --git a/ldap/servers/slapd/pw.c b/ldap/servers/slapd/pw.c
index 3a545e1..451be36 100644
--- a/ldap/servers/slapd/pw.c
+++ b/ldap/servers/slapd/pw.c
@@ -209,7 +209,7 @@ pw_name2scheme(char *name)
     struct pw_scheme *pwsp;
     struct slapdplugin *p;
 
-    if ((p = plugin_get_pwd_storage_scheme(name, strlen(name), PLUGIN_LIST_PWD_STORAGE_SCHEME)) != NULL) {
+    if (name != NULL && (p = plugin_get_pwd_storage_scheme(name, strlen(name), PLUGIN_LIST_PWD_STORAGE_SCHEME)) != NULL) {
         pwsp = (struct pw_scheme *)slapi_ch_malloc(sizeof(struct pw_scheme));
         if (pwsp != NULL) {
             typedef int (*CMPFP)(char *, char *);
@@ -1612,18 +1612,18 @@ pw_get_admin_users(passwdPolicy *pwp)
 passwdPolicy *
 new_passwdPolicy(Slapi_PBlock *pb, const char *dn)
 {
+    slapdFrontendConfig_t *slapdFrontendConfig = NULL;
     Slapi_ValueSet *values = NULL;
+    Slapi_Value **sval = NULL;
     Slapi_Entry *e = NULL, *pw_entry = NULL;
-    int type_name_disposition = 0;
+    passwdPolicy *pwdpolicy = NULL;
+    Slapi_Attr *attr = NULL;
+    char *pwscheme_name = NULL;
+    char *attr_name = NULL;
     char *actual_type_name = NULL;
+    int type_name_disposition = 0;
     int attr_free_flags = 0;
     int rc = 0;
-    passwdPolicy *pwdpolicy = NULL;
-    struct pw_scheme *pwdscheme = NULL;
-    Slapi_Attr *attr;
-    char *attr_name;
-    Slapi_Value **sval;
-    slapdFrontendConfig_t *slapdFrontendConfig;
     int optype = -1;
 
     /* If we already allocated a pw policy, return it */
@@ -1717,9 +1717,7 @@ new_passwdPolicy(Slapi_PBlock *pb, const char *dn)
                     pw_entry = get_entry(pb, bvp->bv_val);
                 }
             }
-
             slapi_vattr_values_free(&values, &actual_type_name, attr_free_flags);
-
             slapi_entry_free(e);
 
             if (pw_entry == NULL) {
@@ -1732,7 +1730,11 @@ new_passwdPolicy(Slapi_PBlock *pb, const char *dn)
 
             /* Set the default values (from libglobs.c) */
             pwpolicy_init_defaults(pwdpolicy);
-            pwdpolicy->pw_storagescheme = slapdFrontendConfig->pw_storagescheme;
+
+            /* Set the current storage scheme */
+            pwscheme_name = config_get_pw_storagescheme();
+            pwdpolicy->pw_storagescheme = pw_name2scheme(pwscheme_name);
+            slapi_ch_free_string(&pwscheme_name);
 
             /* Set the defined values now */
             for (slapi_entry_first_attr(pw_entry, &attr); attr;
@@ -1865,6 +1867,7 @@ new_passwdPolicy(Slapi_PBlock *pb, const char *dn)
                     }
                 } else if (!strcasecmp(attr_name, "passwordstoragescheme")) {
                     if ((sval = attr_get_present_values(attr))) {
+                        free_pw_scheme(pwdpolicy->pw_storagescheme);
                         pwdpolicy->pw_storagescheme =
                             pw_name2scheme((char *)slapi_value_get_string(*sval));
                     }
@@ -1924,10 +1927,9 @@ done:
      * structure from slapdFrontendconfig
      */
     *pwdpolicy = slapdFrontendConfig->pw_policy;
-    pwdscheme = (struct pw_scheme *)slapi_ch_calloc(1, sizeof(struct pw_scheme));
-    *pwdscheme = *slapdFrontendConfig->pw_storagescheme;
-    pwdscheme->pws_name = strdup(slapdFrontendConfig->pw_storagescheme->pws_name);
-    pwdpolicy->pw_storagescheme = pwdscheme;
+    pwscheme_name = config_get_pw_storagescheme();
+    pwdpolicy->pw_storagescheme = pw_name2scheme(pwscheme_name);
+    slapi_ch_free_string(&pwscheme_name);
     pwdpolicy->pw_admin = slapi_sdn_dup(slapdFrontendConfig->pw_policy.pw_admin);
     pw_get_admin_users(pwdpolicy);
     if (pb) {