[postgis-tickets] r17716 - Guard against reading into pointarrays when size of array == 0

[Paul Ramsey]

Author: pramsey
Date: 2019-08-15 10:00:19 -0700 (Thu, 15 Aug 2019)
New Revision: 17716

Modified:
   trunk/liblwgeom/gserialized1.c
   trunk/liblwgeom/gserialized2.c
Log:
Guard against reading into pointarrays when size of array == 0


Modified: trunk/liblwgeom/gserialized1.c
===================================================================
--- trunk/liblwgeom/gserialized1.c	2019-08-14 22:29:10 UTC (rev 17715)
+++ trunk/liblwgeom/gserialized1.c	2019-08-15 17:00:19 UTC (rev 17716)
@@ -861,7 +861,8 @@
 			lwerror("Dimensions mismatch in lwpoly");
 
 		pasize = pa->npoints * ptsize;
-		memcpy(loc, getPoint_internal(pa, 0), pasize);
+		if ( pa->npoints > 0 )
+			memcpy(loc, getPoint_internal(pa, 0), pasize);
 		loc += pasize;
 	}
 	return (size_t)(loc - buf);

Modified: trunk/liblwgeom/gserialized2.c
===================================================================
--- trunk/liblwgeom/gserialized2.c	2019-08-14 22:29:10 UTC (rev 17715)
+++ trunk/liblwgeom/gserialized2.c	2019-08-15 17:00:19 UTC (rev 17716)
@@ -919,7 +919,8 @@
 			lwerror("Dimensions mismatch in lwpoly");
 
 		pasize = pa->npoints * ptsize;
-		memcpy(loc, getPoint_internal(pa, 0), pasize);
+		if ( pa->npoints > 0 )
+			memcpy(loc, getPoint_internal(pa, 0), pasize);
 		loc += pasize;
 	}
 	return (size_t)(loc - buf);
@@ -1685,4 +1686,4 @@
 	}
 
 	return g_out;
-}
\ No newline at end of file
+}