CVE-2018-1000121.patch

From 8f341a5d6f15381492ca2013325d485b6d8d1c13 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 6 Mar 2018 23:02:16 +0100
Subject: [PATCH] openldap: check ldap_get_attribute_ber() results for NULL
 before using

CVE-2018-1000121
Reported-by: Dario Weisser
Bug: https://curl.se/docs/adv_2018-97a2.html
---
 lib/openldap.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/openldap.c b/lib/openldap.c
index f2ffdfe67..6927275cf 100644
--- a/lib/openldap.c
+++ b/lib/openldap.c
@@ -471,11 +471,11 @@ static ssize_t ldap_recv(struct connectdata *conn, int sockindex, char *buf,
   if(!msg)
     return ret;
 
   for(ent = ldap_first_message(li->ld, msg); ent;
     ent = ldap_next_message(li->ld, ent)) {
-    struct berval bv, *bvals, **bvp = &bvals;
+    struct berval bv, *bvals;
     int binary = 0, msgtype;
     CURLcode writeerr;
 
     msgtype = ldap_msgtype(ent);
     if(msgtype == LDAP_RES_SEARCH_RESULT) {
@@ -533,13 +533,13 @@ static ssize_t ldap_recv(struct connectdata *conn, int sockindex, char *buf,
       *err = writeerr;
       return -1;
     }
     data->req.bytecount += bv.bv_len + 5;
 
-    for(rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, bvp);
-      rc == LDAP_SUCCESS;
-      rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, bvp)) {
+    for(rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, &bvals);
+        (rc == LDAP_SUCCESS) && bvals;
+        rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, &bvals)) {
       int i;
 
       if(bv.bv_val == NULL) break;
 
       if(bv.bv_len > 7 && !strncmp(bv.bv_val + bv.bv_len - 7, ";binary", 7))
-- 
2.16.1