e_aes.c: prevent potential DoS in aes_gcm_tls_cipher.

diff --git a/crypto/evp/e_aes.c b/crypto/evp/e_aes.c
index e3bd2b498221bedd9ab11776d652e4806f172825..95d7421168296ed96ff6d2306725ed0f6aa096c2 100644 (file)
--- a/crypto/evp/e_aes.c
+++ b/crypto/evp/e_aes.c
@@ -940,7 +940,7 @@ static int aes_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
        EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
        int rv = -1;
        /* Encrypt/decrypt must be performed in place */
-       if (out != in)
+       if (out != in || len < (EVP_GCM_TLS_EXPLICIT_IV_LEN+EVP_GCM_TLS_TAG_LEN))
                return -1;
        /* Set IV from start of buffer or generate IV and write to start
         * of buffer.