From 624efd2ba6f1dabdcdecf17c77bd206c421efdaf Mon Sep 17 00:00:00 2001
From: zhailiangliang <zhailiangliang@loongson.cn>
Date: Thu, 15 Dec 2022 15:11:14 +0800
Subject: [PATCH] ssl3_mac(): Fix possible divide by zero bug

CLA: trivial

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19912)
---
 ssl/record/methods/ssl3_meth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ssl/record/methods/ssl3_meth.c b/ssl/record/methods/ssl3_meth.c
index de4ce8b67ee..279a3d11e83 100644
--- a/ssl/record/methods/ssl3_meth.c
+++ b/ssl/record/methods/ssl3_meth.c
@@ -221,7 +221,7 @@ static int ssl3_mac(OSSL_RECORD_LAYER *rl, TLS_RL_RECORD *rec, unsigned char *md
     hash = rl->md_ctx;
 
     t = EVP_MD_CTX_get_size(hash);
-    if (t < 0)
+    if (t <= 0)
         return 0;
     md_size = t;
     npad = (48 / md_size) * md_size;
-- 
2.47.3