container/heap: fix int overflow bug

R=golang-dev, rsc CC=golang-dev https://golang.org/cl/7450052
2013-03-04 10:25:21 -05:00 · 2013-03-04 10:25:21 -05:00 · d4a020dec1
parent 9d6e02742c
commit d4a020dec1
1 changed files with 1 additions and 1 deletions
--- a/src/pkg/container/heap/heap.go
+++ b/src/pkg/container/heap/heap.go
@ -90,7 +90,7 @@ func up(h Interface, j int) {
 func down(h Interface, i, n int) {
 	for {
 		j1 := 2*i + 1
-		if j1 >= n {
+		if j1 >= n || j1 < 0 { // j1 < 0 after int overflow
 			break
 		}
 		j := j1 // left child