From: Tomas Mraz <tomas@openssl.org>
Date: Tue, 27 Dec 2022 10:22:05 +0000 (+0100)
Subject: Avoid possible divide by zero
X-Git-Tag: openssl-3.0.8~81
X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff_plain;h=0a69ca8f635f88b0488c5684410f97e22346c0bc

Avoid possible divide by zero

Backport of commit 624efd2

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19967)

(cherry picked from commit 8c29e5ebfd5f19442422ba43fea4c95816417e34)
---

diff --git a/ssl/record/ssl3_record.c b/ssl/record/ssl3_record.c
index dcaaeef951..368aaea5e9 100644
--- a/ssl/record/ssl3_record.c
+++ b/ssl/record/ssl3_record.c
@@ -1314,7 +1314,7 @@ int n_ssl3_mac(SSL *ssl, SSL3_RECORD *rec, unsigned char *md, int sending)
     }
 
     t = EVP_MD_CTX_get_size(hash);
-    if (t < 0)
+    if (t <= 0)
         return 0;
     md_size = t;
     npad = (48 / md_size) * md_size;