From 1f9ae3ee6dbf794bdc3f41330fec8c4dc323e7e7 Mon Sep 17 00:00:00 2001
From: Bborie Park <bkpark at ucdavis.edu>
Date: Tue, 31 Jan 2012 14:46:42 +0000
Subject: [PATCH] Added check of band # passed to ST_DumpAsPolygons.  Fixes
 #1514.

git-svn-id: http://svn.osgeo.org/postgis/trunk@8973 b70326c6-7e19-0410-871a-916f4a2858ee
---
 raster/rt_pg/rt_pg.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/raster/rt_pg/rt_pg.c b/raster/rt_pg/rt_pg.c
index 87606d62c..a4294e49b 100644
--- a/raster/rt_pg/rt_pg.c
+++ b/raster/rt_pg/rt_pg.c
@@ -819,6 +819,8 @@ Datum RASTER_dumpAsWKTPolygons(PG_FUNCTION_ARGS)
     /* stuff done only on the first call of the function */
     if (SRF_IS_FIRSTCALL())
     {
+				int numbands;
+
         POSTGIS_RT_DEBUG(2, "RASTER_dumpAsWKTPolygons first call");
 
         /* create a function context for cross-call persistence */
@@ -847,6 +849,14 @@ Datum RASTER_dumpAsWKTPolygons(PG_FUNCTION_ARGS)
 
         POSTGIS_RT_DEBUGF(3, "band %d", nband);
 
+				numbands = rt_raster_get_num_bands(raster);
+				if (nband < 1 || nband > numbands) {
+					elog(NOTICE, "Invalid band index (must use 1-based). Returning NULL");
+					rt_raster_destroy(raster);
+					MemoryContextSwitchTo(oldcontext);
+					SRF_RETURN_DONE(funcctx);
+				}
+
         /* Polygonize raster */
 
         /**
-- 
2.50.1