X-Git-Url: https://git.distorted.org.uk/~mdw/adns/blobdiff_plain/8b9cc94c86219c75366c091e8a604d3420c155a0..d8fa191ed7774818862febd6ade774cb7e149ab9:/regress/hcommon.c.m4

diff --git a/regress/hcommon.c.m4 b/regress/hcommon.c.m4
index c5069ee..330da4d 100644
--- a/regress/hcommon.c.m4
+++ b/regress/hcommon.c.m4
@@ -301,7 +301,7 @@ void *Hrealloc(void *op, size_t nsz) {
 
   if (op) { oldnode= (void*)((char*)op - MALLOCHSZ); osz= oldnode->sz; } else { osz= 0; }
   np= Hmalloc(nsz);
-  memcpy(np,op, osz>nsz ? nsz : osz);
+  if (osz) memcpy(np,op, osz>nsz ? nsz : osz);
   Hfree(op);
   return np;
 }