debug/plan9obj: index out of range in Symbols

[catenacyber]

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

$ go version
go version go1.17.6 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/catena/Library/Caches/go-build"
GOENV="/Users/catena/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/catena/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/catena/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="go1.17.6"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/catena/go/src/github.com/catenacyber/go/src/go.mod"
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 x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/pp/dc1dtf9x2js3v0jx_m010nqr0000gn/T/go-build4237848497=/tmp/go-build -gno-record-gcc-switches -fno-common"
GOROOT/bin/go version: go version go1.17.6 darwin/amd64
GOROOT/bin/go tool compile -V: compile version go1.17.6
uname -v: Darwin Kernel Version 21.3.0: Wed Jan  5 21:37:58 PST 2022; root:xnu-8019.80.24~20/RELEASE_X86_64
ProductName:    macOS
ProductVersion: 12.2.1
BuildVersion:   21D62
lldb --version: lldb-1316.0.9.41
Apple Swift version 5.6 (swiftlang-5.6.0.323.62 clang-1316.0.20.8)
gdb --version: GNU gdb (GDB) 9.1

What did you do?

Run https://go.dev/play/p/pHF7A-Fq4CY?v=gotip

What did you expect to see?

The program finishing and printing Hello

What did you see instead?

panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
debug/plan9obj.walksymtab({0xc000116000?, 0x33, 0x4157af?}, 0x8, 0xc00009adc0)
    /usr/local/go-faketime/src/debug/plan9obj/file.go:215 +0x34f
debug/plan9obj.newTable({0xc000116000, 0x33, 0x33}, 0x0?)
    /usr/local/go-faketime/src/debug/plan9obj/file.go:254 +0x75
debug/plan9obj.(*File).Symbols(0xc000114000)
    /usr/local/go-faketime/src/debug/plan9obj/file.go:315 +0xf7
main.main()
    /tmp/sandbox4190564949/prog.go:13 +0x145

Program exited.

Found by https://github.com/catenacyber/ngolo-fuzzing on oss-fuzz https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=50504

cc @ianlancetaylor as you fixed #52521

[gopherbot]

Change https://go.dev/cl/425115 mentions this issue: debug/plan9obj: don't crash on EOF before symbol type