1 files changed, 2 insertions, 0 deletions
diff --git a/ssl/ssl_ciph.c b/ssl/ssl_ciph.c
index 31c0d5af1d..6e49d6b400 100644
--- a/ssl/ssl_ciph.c
+++ b/ssl/ssl_ciph.c
@@ -2221,6 +2221,8 @@ int ssl_cipher_get_overhead(const SSL_CIPHER *c, size_t *mac_overhead,
             in = 1; /* padding length byte */
             out = EVP_CIPHER_get_iv_length(e_ciph);
             blk = EVP_CIPHER_get_block_size(e_ciph);
+            if (blk == 0)
+                return 0;
         }
     }