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-rw-r--r--ssl/record/ssl3_buffer.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/ssl/record/ssl3_buffer.c b/ssl/record/ssl3_buffer.c
index b9ba25e0c3f8..fa597c274671 100644
--- a/ssl/record/ssl3_buffer.c
+++ b/ssl/record/ssl3_buffer.c
@@ -1,5 +1,5 @@
/*
- * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
@@ -97,11 +97,16 @@ int ssl3_setup_write_buffer(SSL *s, size_t numwpipes, size_t len)
#endif
len = ssl_get_max_send_fragment(s)
- + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
+ + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align
+ + SSL_RT_MAX_CIPHER_BLOCK_SIZE /* Explicit IV allowance */;
#ifndef OPENSSL_NO_COMP
if (ssl_allow_compression(s))
len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
#endif
+ /*
+ * We don't need to add an allowance for eivlen here since empty
+ * fragments only occur when we don't have an explicit IV
+ */
if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
}