cmd/pprof: update vendored github.com/google/pprof

Pull in the latest published version of github.com/google/pprof
as part of the continuous process of keeping Go's dependencies
up to date.

For #36905.

[git-generate]
cd src/cmd
go get github.com/google/pprof@v0.0.0-20251114195745-4902fdda35c8
go mod tidy
go mod vendor

Change-Id: Id26eb632f637fb2c602d87cb83fdff7f099934ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/725500
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/src/cmd/vendor/github.com/google/pprof/profile/proto.go b/src/cmd/vendor/github.com/google/pprof/profile/proto.go
index a15696ba16..31bf6bca63 100644
--- a/src/cmd/vendor/github.com/google/pprof/profile/proto.go
+++ b/src/cmd/vendor/github.com/google/pprof/profile/proto.go
@@ -36,6 +36,7 @@ package profile
 import (
 	"errors"
 	"fmt"
+	"slices"
 )
 
 type buffer struct {
@@ -187,6 +188,16 @@ func le32(p []byte) uint32 {
 	return uint32(p[0]) | uint32(p[1])<<8 | uint32(p[2])<<16 | uint32(p[3])<<24
 }
 
+func peekNumVarints(data []byte) (numVarints int) {
+	for ; len(data) > 0; numVarints++ {
+		var err error
+		if _, data, err = decodeVarint(data); err != nil {
+			break
+		}
+	}
+	return numVarints
+}
+
 func decodeVarint(data []byte) (uint64, []byte, error) {
 	var u uint64
 	for i := 0; ; i++ {
@@ -286,6 +297,9 @@ func decodeInt64(b *buffer, x *int64) error {
 func decodeInt64s(b *buffer, x *[]int64) error {
 	if b.typ == 2 {
 		// Packed encoding
+		dataLen := peekNumVarints(b.data)
+		*x = slices.Grow(*x, dataLen)
+
 		data := b.data
 		for len(data) > 0 {
 			var u uint64
@@ -316,8 +330,11 @@ func decodeUint64(b *buffer, x *uint64) error {
 
 func decodeUint64s(b *buffer, x *[]uint64) error {
 	if b.typ == 2 {
-		data := b.data
 		// Packed encoding
+		dataLen := peekNumVarints(b.data)
+		*x = slices.Grow(*x, dataLen)
+
+		data := b.data
 		for len(data) > 0 {
 			var u uint64
 			var err error