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cmd/yacc: Prevent index out of range. Fixes #9099.

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Change-Id: I7ef01a738b6ca49af1c148146d439c81b0a33b16
Reviewed-on: https://go-review.googlesource.com/1785
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Jan Mercl 2014-12-18 12:24:16 +01:00 committed by Ian Lance Taylor
parent ddd666b122
commit a034e478a7
1 changed files with 7 additions and 0 deletions
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7
src/cmd/yacc/yacc.go
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@ -3400,6 +3400,13 @@ $$default:
_ = $$pt // guard against "declared and not used"
$$p -= $$R2[$$n]
// $$p is now the index of $0. Perform the default action. Iff the
// reduced production is ε, $1 is possibly out of range.
if $$p+1 >= len($$S) {
nyys := make([]$$SymType, len($$S)*2)
copy(nyys, $$S)
$$S = nyys
}
$$VAL = $$S[$$p+1]
/* consult goto table to find next state */