Check for zero records and return immediately

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2822)
(cherry picked from commit a3004c820370b6bee82c919721fb1cbe95f72f3f)

diff --git a/ssl/record/ssl3_record.c b/ssl/record/ssl3_record.c
index 03c5294046837acb394faf4c4aee055800f27655..5da44e5efbb2a1f0a85dcb8cd68c628191f17d68 100644 (file)
--- a/ssl/record/ssl3_record.c
+++ b/ssl/record/ssl3_record.c
@@ -661,6 +661,9 @@ int tls1_enc(SSL *s, SSL3_RECORD *recs, unsigned int n_recs, int send)
     const EVP_CIPHER *enc;
     unsigned int ctr;
 
+    if (n_recs == 0)
+        return 0;
+
     if (send) {
         if (EVP_MD_CTX_md(s->write_hash)) {
             int n = EVP_MD_CTX_size(s->write_hash);