From 6bae7050c33b98844a2aabc715ec1aaa78cd4b8d Mon Sep 17 00:00:00 2001
From: jl777 <jameslee777@yahoo.com>
Date: Thu, 4 Jul 2019 01:13:17 -1100
Subject: [PATCH] Clear freed ptr

---
 src/komodo_nSPV.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/komodo_nSPV.h b/src/komodo_nSPV.h
index b9ee8897d..701f144b7 100644
--- a/src/komodo_nSPV.h
+++ b/src/komodo_nSPV.h
@@ -535,15 +535,24 @@ int32_t NSPV_setequihdr(struct NSPV_equihdr *hdr,int32_t height)
 int32_t NSPV_getntzsproofresp(struct NSPV_ntzsproofresp *ptr,int32_t prevht,int32_t nextht)
 {
     int32_t i; uint256 hashBlock;
+    if ( prevht > nextht || (nextht-prevht) > 1440 )
+    {
+        fprintf(stderr,"illegal prevht.%d nextht.%d\n",prevht,nextht);
+        return(-1);
+    }
     ptr->prevtxidht = prevht;
     ptr->nexttxidht = nextht;
     ptr->common.numhdrs = (nextht - prevht + 1);
     ptr->common.hdrs = (struct NSPV_equihdr *)calloc(ptr->common.numhdrs,sizeof(*ptr->common.hdrs));
+    fprintf(stderr,"allocate numhdrs.%d\n",ptr->common.numhdrs);
     for (i=0; i<ptr->common.numhdrs; i++)
     {
+        fprintf(stderr,"%d ht.%d\n",i,prevht+i);
         if ( NSPV_setequihdr(&ptr->common.hdrs[i],prevht+i) < 0 )
         {
+            fprintf(stderr,"error setting hdr.%d\n",prevht+i);
             free(ptr->common.hdrs);
+            ptr->common.hdrs = 0;
             return(-1);
         }
     }