From 0e2b6091e90dea687f1b2d336a053484faf225b9 Mon Sep 17 00:00:00 2001
From: Pauli <paul.dale@oracle.com>
Date: Mon, 27 Apr 2020 09:04:05 +1000
Subject: [PATCH] coverity 1462564 Improper use of negative value

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11651)
---
 providers/implementations/macs/kmac_prov.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/providers/implementations/macs/kmac_prov.c b/providers/implementations/macs/kmac_prov.c
index 6feaba7695..451b52460c 100644
--- a/providers/implementations/macs/kmac_prov.c
+++ b/providers/implementations/macs/kmac_prov.c
@@ -250,6 +250,8 @@ static int kmac_init(void *vmacctx)
         return 0;
 
     block_len = EVP_MD_block_size(ossl_prov_digest_md(&kctx->digest));
+    if (block_len < 0)
+        return 0;
 
     /* Set default custom string if it is not already set */
     if (kctx->custom_len == 0) {