Avoid reading into empty ptarray

References #4475

git-svn-id: http://svn.osgeo.org/postgis/branches/2.3@17721 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/liblwgeom/g_serialized.c b/liblwgeom/g_serialized.c
index 167ed84d3d0fb94af543016a94f741d5f14081d3..ded19115df6c550561b5f8934d28870561be9564 100644 (file)
--- a/liblwgeom/g_serialized.c
+++ b/liblwgeom/g_serialized.c
@@ -706,7 +706,8 @@ static size_t gserialized_from_lwpoly(const LWPOLY *poly, uint8_t *buf)
                        lwerror("Dimensions mismatch in lwpoly");
 
                pasize = pa->npoints * ptsize;
-               memcpy(loc, getPoint_internal(pa, 0), pasize);
+               if ( pasize )
+                       memcpy(loc, getPoint_internal(pa, 0), pasize);
                loc += pasize;
        }
        return (size_t)(loc - buf);