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)

diff --git a/ssl/record/ssl3_record.c b/ssl/record/ssl3_record.c
index 84f54cbabd1ea2fea863f4c3c69ea75d6bf10efc..3868bb5d82ed5e89fc58639ddc57bff72ce9bcae 100644 (file)
--- a/ssl/record/ssl3_record.c
+++ b/ssl/record/ssl3_record.c
@@ -740,6 +740,9 @@ int tls1_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int send)
     int imac_size;
     const EVP_CIPHER *enc;
 
+    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);