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x/mod/modfile: crash on AddGoStmt for an empty File #62457

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hajimehoshi opened this issue Sep 5, 2023 · 2 comments
Closed

x/mod/modfile: crash on AddGoStmt for an empty File #62457

hajimehoshi opened this issue Sep 5, 2023 · 2 comments
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FixPending Issues that have a fix which has not yet been reviewed or submitted. help wanted modules NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Unreleased

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@hajimehoshi
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What version of Go are you using (go version)?

$ go version
go version go1.20.4 darwin/amd64

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="amd64"
GOBIN=""
GOCACHE="/Users/hajimehoshi/Library/Caches/go-build"
GOENV="/Users/hajimehoshi/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/hajimehoshi/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/hajimehoshi/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.20.4"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/60/khbk2xqn1c5bml1byjn89dwc0000gn/T/go-build3215930630=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Run this program w/ golang.org/x/mod@v0.12.0:

package main

import "golang.org/x/mod/modfile"

func main() {
	f := &modfile.File{}
	f.AddGoStmt("1.20")
}

https://go.dev/play/p/G0zKRp7VvSf

What did you expect to see?

No crash

What did you see instead?

Crash

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x60 pc=0x4996ee]

goroutine 1 [running]:
golang.org/x/mod/modfile.(*FileSyntax).addLine(0x0, {0x0, 0x0}, {0xc000060060, 0x2, 0x2})
	/tmp/gopath1845778283/pkg/mod/golang.org/x/mod@v0.12.0/modfile/read.go:108 +0x6e
golang.org/x/mod/modfile.(*File).AddGoStmt(0xc000051eb0, {0x4b93c8, 0x4})
	/tmp/gopath1845778283/pkg/mod/golang.org/x/mod@v0.12.0/modfile/rule.go:980 +0x1c5
main.main()
	/tmp/sandbox2831237298/main.go:7 +0x49
@gopherbot gopherbot added this to the Unreleased milestone Sep 5, 2023
@hajimehoshi
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/CC @bcmills

@hajimehoshi hajimehoshi changed the title x/mod: crash on AddGoStmt for an empty File x/mod/modfile: crash on AddGoStmt for an empty File Sep 5, 2023
@cherrymui cherrymui added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Sep 7, 2023
@bcmills bcmills added help wanted NeedsFix The path to resolution is known, but the work has not been done. FixPending Issues that have a fix which has not yet been reviewed or submitted. modules and removed FixPending Issues that have a fix which has not yet been reviewed or submitted. labels Jan 23, 2024
@gopherbot gopherbot removed the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Jan 23, 2024
@gopherbot
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Change https://go.dev/cl/570115 mentions this issue: modfile: fix crash on AddGoStmt in empty File

@dmitshur dmitshur added the FixPending Issues that have a fix which has not yet been reviewed or submitted. label Mar 8, 2024
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@hajimehoshi @dmitshur @bcmills @gopherbot @cherrymui