# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1605093804 -7200
# Node ID ffd97ca9dfce71b5c594d9e3e48e282f949e2755
# Parent  e73200c4584ab27f85a3d3907d25228d71922677
Check for length > 0.

diff -r e73200c4584a -r ffd97ca9dfce th_ioctx_mem.c
--- a/th_ioctx_mem.c	Mon Oct 26 12:48:37 2020 +0200
+++ b/th_ioctx_mem.c	Wed Nov 11 13:23:24 2020 +0200
@@ -191,8 +191,12 @@
         length = size * nmemb;
     }
 
-    memcpy(buf, ctx->memData + ctx->memOffset, length);
-    ctx->memOffset += length;
+    if (length > 0)
+    {
+        memcpy(buf, ctx->memData + ctx->memOffset, length);
+        ctx->memOffset += length;
+    }
+
     return nmemb;
 }