From 60a7720a2498b66e31b27c525592719d9f39f897 Mon Sep 17 00:00:00 2001
From: practicalswift <practicalswift@users.noreply.github.com>
Date: Mon, 5 Mar 2018 17:46:14 +0100
Subject: [PATCH] Avoid passing NULL argument to memcpy

---
 bitcoin/pullpush.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bitcoin/pullpush.c b/bitcoin/pullpush.c
index a112b6c5c..23722aa88 100644
--- a/bitcoin/pullpush.c
+++ b/bitcoin/pullpush.c
@@ -1,5 +1,6 @@
 #include "pullpush.h"
 #include "varint.h"
+#include <assert.h>
 #include <ccan/endian/endian.h>
 #include <ccan/mem/mem.h>
 #include <ccan/tal/tal.h>
@@ -58,6 +59,7 @@ const u8 *pull(const u8 **cursor, size_t *max, void *copy, size_t n)
 	}
 	*cursor += n;
 	*max -= n;
+	assert(p);
 	if (copy)
 		memcpy(copy, p, n);
 	return memcheck(p, n);