From 1a27cd1548cfcfbc4b22b3a36386a0fc98148fce Mon Sep 17 00:00:00 2001
From: James Prestwood <prestwoj@gmail.com>
Date: Thu, 16 Dec 2021 10:00:02 -0800
Subject: [PATCH] crypto: allow NULL 'ad' to aes_siv_decrypt

---
 src/crypto.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/crypto.c b/src/crypto.c
index 475ebf36..cd50d6f7 100644
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -389,7 +389,9 @@ bool aes_siv_decrypt(const void *key, size_t key_len, const void *in,
 	if (in_len < 16)
 		return false;
 
-	memcpy(iov, ad, sizeof(struct iovec) * num_ad);
+	if (ad)
+		memcpy(iov, ad, sizeof(struct iovec) * num_ad);
+
 	iov[num_ad].iov_base = (void *)out;
 	iov[num_ad].iov_len = in_len - 16;
 	num_ad++;