From daa08e610259d00de9c96953313f761dbf9a9055 Mon Sep 17 00:00:00 2001
From: Leo Yuriev <leo@yuriev.ru>
Date: Tue, 21 Feb 2017 17:15:04 +0300
Subject: [PATCH] mdbx: assert for NODEPTR.

---
 mdbx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mdbx.c b/mdbx.c
index 16bbab74..961cf7bb 100644
--- a/mdbx.c
+++ b/mdbx.c
@@ -763,7 +763,11 @@ typedef struct MDB_node {
 #define LEAFSIZE(k, d) (NODESIZE + (k)->mv_size + (d)->mv_size)
 
 /** Address of node \b i in page \b p */
-#define NODEPTR(p, i) ((MDB_node *)((char *)(p) + (p)->mp_ptrs[i] + PAGEBASE))
+#define NODEPTR(p, i)                                                          \
+  ({                                                                           \
+    assert(NUMKEYS(p) > (unsigned)(i));                                        \
+    (MDB_node *)((char *)(p) + (p)->mp_ptrs[i] + PAGEBASE);                    \
+  })
 
 /** Address of the key for the node */
 #define NODEKEY(node) (void *)((node)->mn_data)