# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1493250413 -10800
# Node ID a9a60da06ae32c7033dfca77414bb3ab75f80790
# Parent  403c67bcb76a3c308e45be37296c6b8f342037b4
Check for NULL buffer and 0 length of data in bpg_add_md_contents().

diff -r 403c67bcb76a -r a9a60da06ae3 bpgenc.c
--- a/bpgenc.c	Wed Apr 26 18:24:15 2017 +0300
+++ b/bpgenc.c	Thu Apr 27 02:46:53 2017 +0300
@@ -927,6 +927,9 @@
 {
     BPGMetaData *md;
 
+    if (buf == NULL || len == 0)
+        return -2;
+
     if ((md = bpg_md_alloc(tag)) == NULL)
         goto err;