cipher: If in is null, skip adding it to iovec

Be pedantic and skip adding 'in' to the iovec in operate_cipher() if the
in variable is NULL.  It is up to callers of operate_cipher to enforce
how 'in' is used, in particular l_aead_cipher_encrypt already does so.

1 files changed, 8 insertions, 3 deletions

diff --git a/ell/cipher.c b/ell/cipher.c
index 6b8528c2..0e4244f7 100644
--- a/ell/cipher.c
+++ b/ell/cipher.c
@@ -338,9 +338,14 @@ static ssize_t operate_cipher(int sk, __u32 operation,
 
 		iov[0].iov_base = (void *) ad;
 		iov[0].iov_len = ad_len;
-		iov[1].iov_base = (void *) in;
-		iov[1].iov_len = in_len;
-		msg.msg_iovlen = 2;
+
+		msg.msg_iovlen = 1;
+
+		if (in) {
+			iov[1].iov_base = (void *) in;
+			iov[1].iov_len = in_len;
+			msg.msg_iovlen = 2;
+		}
 	} else {
 		iov[0].iov_base = (void *) in;
 		iov[0].iov_len = in_len;