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encoding/json/v2: fix UnmarshalDecode regression with EOF

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When EOF is encountered within jsontext.Decoder stream without
starting to parse any token, UnmarshalDecode should report EOF,
rather than converting it into ErrUnexpectedEOF.

This fixes a regression introduced by https://go.dev/cl/689919.

This change only affects code compiled under goexperiment.jsonv2.

Fixes #74835

Change-Id: I7e8e57ab11b462c422c538503ed8c6b91ead53bd
Reviewed-on: https://go-review.googlesource.com/c/go/+/692175
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Jake Bailey <jacob.b.bailey@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
This commit is contained in:
Joe Tsai 2025-07-31 15:01:47 -07:00 • committed by Gopher Robot
parent b096ddb9ea
commit cf4af0b2f3
2 changed files with 47 additions and 2 deletions
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4
src/encoding/json/v2/arshal.go
View file

@ -470,7 +470,7 @@ func unmarshalDecode(in *jsontext.Decoder, out any, uo *jsonopts.Struct, last bo
// was validated before attempting to unmarshal it.
if uo.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
if err := export.Decoder(in).CheckNextValue(last); err != nil {
if err == io.EOF {
if err == io.EOF && last {
offset := in.InputOffset() + int64(len(in.UnreadBuffer()))
return &jsontext.SyntacticError{ByteOffset: offset, Err: io.ErrUnexpectedEOF}
}
@ -487,7 +487,7 @@ func unmarshalDecode(in *jsontext.Decoder, out any, uo *jsonopts.Struct, last bo
if !uo.Flags.Get(jsonflags.AllowDuplicateNames) {
export.Decoder(in).Tokens.InvalidateDisabledNamespaces()
}
if err == io.EOF {
if err == io.EOF && last {
offset := in.InputOffset() + int64(len(in.UnreadBuffer()))
return &jsontext.SyntacticError{ByteOffset: offset, Err: io.ErrUnexpectedEOF}
}