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[dev.link] cmd/link/internal/loader: fix buglet in section handling

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Allow for the possibility that a client could call newExtSym(), then
ask for the section of the new sym before SetSectSym is called on it
(check in SymSect for this case).

Change-Id: I7bd78e7b3b7618943705b616f62ea78c4a1b68d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/229603
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
Than McIntosh 2020-04-23 08:43:29 -04:00
parent 67bf856b96
commit adea6a90e3
1 changed files with 6 additions and 0 deletions
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6
src/cmd/link/internal/loader/loader.go
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@ -1075,6 +1075,12 @@ func (l *Loader) SetSymAlign(i Sym, align int32) {
// SymValue returns the section of the i-th symbol. i is global index.
func (l *Loader) SymSect(i Sym) *sym.Section {
if int(i) >= len(l.symSects) {
// symSects is extended lazily -- it the sym in question is
// outside the range of the existing slice, then we assume its
// section has not yet been set.
return nil
}
return l.sects[l.symSects[i]]
}