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debug/elf: don't panic if symtab too small

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No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.

For #47653
Fixes #75130

Change-Id: Ie6015564bb98334377383bbc16d79119dc4e36f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/698855
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Florian Lehner <lehner.florian86@gmail.com>
This commit is contained in:
Ian Lance Taylor 2025-08-24 13:17:56 -07:00 • committed by Gopher Robot
parent 2ee4b31242
commit 765905e3bd
1 changed files with 3 additions and 0 deletions
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3
src/debug/elf/file.go
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@ -692,6 +692,9 @@ func (f *File) getSymbols64(typ SectionType) ([]Symbol, []byte, error) {
if len(data)%Sym64Size != 0 { if len(data)%Sym64Size != 0 {
return nil, nil, errors.New("length of symbol section is not a multiple of Sym64Size") return nil, nil, errors.New("length of symbol section is not a multiple of Sym64Size")
} }
if len(data) == 0 {
return nil, nil, ErrNoSymbols
}
strdata, err := f.stringTable(symtabSection.Link) strdata, err := f.stringTable(symtabSection.Link)
if err != nil { if err != nil {