From 89e6b1eebc162fd9c62cc3a88f548c7c37067440 Mon Sep 17 00:00:00 2001
From: Daniel Pouzzner <douzzer@wolfssl.com>
Date: Thu, 26 Nov 2020 01:48:04 -0600
Subject: [PATCH] wc_ecc_mulmod_ex(): be more careful freeing temp key.

---
 wolfcrypt/src/ecc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/wolfcrypt/src/ecc.c b/wolfcrypt/src/ecc.c
index c66b4ceb3..c1faba239 100644
--- a/wolfcrypt/src/ecc.c
+++ b/wolfcrypt/src/ecc.c
@@ -3007,8 +3007,10 @@ exit:
    }
 #ifdef WOLFSSL_SMALL_STACK_CACHE
    if (key) {
-       R->key = NULL;
-       ecc_key_tmp_final(key, heap);
+       if (R)
+           R->key = NULL;
+       if (err == MP_OKAY)
+           ecc_key_tmp_final(key, heap);
        XFREE(key, heap, DYNAMIC_TYPE_ECC);
    }
 #endif /* WOLFSSL_SMALL_STACK_CACHE */