From: Ian Lance Taylor <iant@golang.org>
Date: Sun, 24 Aug 2025 20:17:56 +0000 (-0700)
Subject: debug/elf: don't panic if symtab too small
X-Git-Tag: go1.26rc1~1010
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=765905e3bd13dcb048388890dba2ea47f6e58711;p=gostls13.git

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

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>
---

diff --git a/src/debug/elf/file.go b/src/debug/elf/file.go
index 89bd70b5b2..50452b5bef 100644
--- a/src/debug/elf/file.go
+++ b/src/debug/elf/file.go
@@ -692,6 +692,9 @@ func (f *File) getSymbols64(typ SectionType) ([]Symbol, []byte, error) {
 	if len(data)%Sym64Size != 0 {
 		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)
 	if err != nil {