image/jpeg: EOF error when decoding image file instead of ErrUnexpectedEOF #56724
Description
What version of Go are you using (go version)?
$ go version go version go1.19.3 darwin/arm64
Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="" GOARCH="arm64" GOBIN="" GOCACHE="/Users/kawashima-kazuh/Library/Caches/go-build" GOENV="/Users/kawashima-kazuh/Library/Application Support/go/env" GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="arm64" GOHOSTOS="darwin" GOINSECURE="" GOMODCACHE="/Users/kawashima-kazuh/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPATH="/Users/kawashima-kazuh/go" GOPRIVATE="" GOPROXY="https://proxy.golang.org,direct" GOROOT="/opt/homebrew/Cellar/go/1.19.3/libexec" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/opt/homebrew/Cellar/go/1.19.3/libexec/pkg/tool/darwin_arm64" GOVCS="" GOVERSION="go1.19.3" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="/Users/kawashima-kazuh/Library/CloudStorage/OneDrive-Cybozu/Yakumo/YLOG-4247(Vermeerで発生するEOFの発生箇所を調査する)/image-test/go.mod" GOWORK="" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/gf/q85z6yx574d7vt8p39gxgmq40000gp/T/go-build1027907948=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
Here is a sample code to reproduce an EOF error:
package main
import(
"io"
"os"
"github.com/pkg/errors"
"fmt"
"image"
"log"
_ "image/jpeg"
)
func main() {
f := os.Stdin
defer f.Close()
_, err := loadImage(f)
if err != nil {
log.Fatalf("can not load image %v", err)
}
}
func loadImage(reader io.Reader) (image.Image, error) {
fmt.Println("load image")
img, _, err := image.Decode(reader)
if err != nil {
return nil, errors.WithStack(err)
}
return img, err
}EOF error occurs when processing the first 24 bytes of the attachment file with the sample code.
head -c24 1x1.jpg | go run main.go
What did you expect to see?
I want to return ErrUnexpectedEOF if err is EOF as follows
if err := d.fill(); err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return err
}
What did you see instead?
image.Decode returned an EOF error.