From: Cherry Zhang <cherryyz@google.com>
Date: Tue, 5 May 2020 17:12:01 +0000 (-0400)
Subject: cmd/compile: use ReadFull to read fingerprint
X-Git-Tag: go1.15beta1~228
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=8627b4c9b50138c75cc7730af7f8db692d33451e;p=gostls13.git

cmd/compile: use ReadFull to read fingerprint

Don't fail on partial read.

May fix #38849.

Change-Id: Icf075d454e1bfe9299b07eea47bbc4d448c3bd5e
Reviewed-on: https://go-review.googlesource.com/c/go/+/232317
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---

diff --git a/src/cmd/compile/internal/gc/iimport.go b/src/cmd/compile/internal/gc/iimport.go
index f3e65ff736..104b5fb79a 100644
--- a/src/cmd/compile/internal/gc/iimport.go
+++ b/src/cmd/compile/internal/gc/iimport.go
@@ -15,6 +15,7 @@ import (
 	"cmd/internal/src"
 	"encoding/binary"
 	"fmt"
+	"io"
 	"math/big"
 	"os"
 	"strings"
@@ -191,7 +192,7 @@ func iimport(pkg *types.Pkg, in *bio.Reader) (fingerprint goobj2.FingerprintType
 	}
 
 	// Fingerprint
-	n, err := in.Read(fingerprint[:])
+	n, err := io.ReadFull(in, fingerprint[:])
 	if err != nil || n != len(fingerprint) {
 		yyerror("import %s: error reading fingerprint", pkg.Path)
 		errorexit()