Fix double free in cookie generation.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
GH: #2850

diff --git a/ssl/statem/extensions_clnt.c b/ssl/statem/extensions_clnt.c
index 23dc8d3363b719f653fb3caf0509c5cd0a5b7a9a..8860462a1f3578468a80990feaa229bb3562f37c 100644 (file)
--- a/ssl/statem/extensions_clnt.c
+++ b/ssl/statem/extensions_clnt.c
@@ -658,6 +658,7 @@ int tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
     ret = 1;
  end:
     OPENSSL_free(s->ext.tls13_cookie);
+    s->ext.tls13_cookie = NULL;
     s->ext.tls13_cookie_len = 0;
 
     return ret;