From 2c2c1778f7e7a7c6c6dbbce72d58e636e46cdc66 Mon Sep 17 00:00:00 2001
From: Andrzej Kurek <Andrzej.Kurek@arm.com>
Date: Wed, 1 Dec 2021 22:25:48 +0100
Subject: [PATCH] Add a changelog entry for the ChaCha20 default behavior
 change

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
---
 ChangeLog.d/chacha20_invalid_iv_len_fix.txt | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 ChangeLog.d/chacha20_invalid_iv_len_fix.txt

diff --git a/ChangeLog.d/chacha20_invalid_iv_len_fix.txt b/ChangeLog.d/chacha20_invalid_iv_len_fix.txt
new file mode 100644
index 000000000..af35e2a00
--- /dev/null
+++ b/ChangeLog.d/chacha20_invalid_iv_len_fix.txt
@@ -0,0 +1,4 @@
+Default behavior changes
+   * mbedtls_cipher_set_iv will now fail with ChaCha20 and ChaCha20+Poly1305
+     for IV lengths other than 12. The library was silently overwriting this
+     length with 12, but did not inform the caller about it. Fixes #4301.