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debug/plan9obj: don't crash on EOF before symbol type

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No debug/plan9obj test case because the problem can only happen for
invalid data. Let the fuzzer find cases like this.

For #47653
Fixes #54585

Change-Id: I8d3e15725b9bc09dd0e6f2750769987021f5e982
Reviewed-on: https://go-review.googlesource.com/c/go/+/425115
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
This commit is contained in:
Ian Lance Taylor 2022-08-22 17:42:54 -07:00 committed by Gopher Robot
parent b72521ee50
commit fc0d423789
1 changed files with 3 additions and 0 deletions
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3
src/debug/plan9obj/file.go
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@ -212,6 +212,9 @@ func walksymtab(data []byte, ptrsz int, fn func(sym) error) error {
p = p[4:]
}
if len(p) < 1 {
return &formatError{len(data), "unexpected EOF", nil}
}
typ := p[0] & 0x7F
s.typ = typ
p = p[1:]