From 9f75367afa8bcd1c3c460c0b72cff7ea5fcecfdc Mon Sep 17 00:00:00 2001
From: Tom Clegg <tom@tomclegg.ca>
Date: Mon, 20 Sep 2021 09:20:30 -0400
Subject: [PATCH] Fix array index out of bounds.

refs #17966

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@curii.com>
---
 slicenumpy.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/slicenumpy.go b/slicenumpy.go
index 88fd817537..2fc2fd6149 100644
--- a/slicenumpy.go
+++ b/slicenumpy.go
@@ -263,8 +263,10 @@ func (cmd *sliceNumpy) RunCommand(prog string, args []string, stdin io.Reader, s
 					count := make([]tileVariantID, len(variants))
 					for _, cg := range cgs {
 						idx := (tag - tagstart) * 2
-						count[cg.Variants[idx]]++
-						count[cg.Variants[idx+1]]++
+						if int(idx) < len(cg.Variants) {
+							count[cg.Variants[idx]]++
+							count[cg.Variants[idx+1]]++
+						}
 					}
 					ranked := make([]tileVariantID, len(variants))
 					for i := range ranked {
-- 
2.30.2