From 59c113d358957f3e5e0764467a38d1bddec4637f Mon Sep 17 00:00:00 2001
From: Sean Parkinson <sean@wolfssl.com>
Date: Mon, 17 Apr 2023 11:40:21 +1000
Subject: [PATCH] SP int: sp_mod check sp_div error before adding and replacing
 error

Fix to not overwrite error when sp_div fails in sp_mod.
---
 wolfcrypt/src/sp_int.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wolfcrypt/src/sp_int.c b/wolfcrypt/src/sp_int.c
index 6198e7c74..d07e27209 100644
--- a/wolfcrypt/src/sp_int.c
+++ b/wolfcrypt/src/sp_int.c
@@ -8434,7 +8434,7 @@ int sp_mod(const sp_int* a, const sp_int* m, sp_int* r)
 #else
     if ((err == MP_OKAY) && (r != m)) {
         err = sp_div(a, m, NULL, r);
-        if ((!sp_iszero(r)) && (r->sign != m->sign)) {
+        if ((err == MP_OKAY) && (!sp_iszero(r)) && (r->sign != m->sign)) {
             err = sp_add(r, m, r);
         }
     }