From 49592833a7c507f06385a4b6b2ec343c05eaf8f8 Mon Sep 17 00:00:00 2001
From: "Wang, Xiang W" <xiang.w.wang@intel.com>
Date: Tue, 9 Jul 2019 20:18:42 -0400
Subject: [PATCH] Scratch: fix scratch free issue when memory allocation fails

Fixes github issue #174
---
 src/scratch.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/scratch.c b/src/scratch.c
index b4630640..25991e2b 100644
--- a/src/scratch.c
+++ b/src/scratch.c
@@ -279,7 +279,9 @@ hs_error_t HS_CDECL hs_alloc_scratch(const hs_database_t *db,
     hs_error_t proto_ret = hs_check_alloc(proto_tmp);
     if (proto_ret != HS_SUCCESS) {
         hs_scratch_free(proto_tmp);
-        hs_scratch_free(*scratch);
+        if (*scratch) {
+            hs_scratch_free((*scratch)->scratch_alloc);
+        }
         *scratch = NULL;
         return proto_ret;
     }