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encoding/gob: fix hang from skipping large slices

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Change-Id: I4e59b5b1702e08d7c6191d0a70fb0a555f3340c8
Reviewed-on: https://go-review.googlesource.com/9061
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Matthew Dempsky 2015-04-17 14:45:51 -07:00 committed by Rob Pike
parent 223ab4dbcc
commit 4d01922e46
2 changed files with 5 additions and 0 deletions
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3
src/encoding/gob/decode.go
View File

@ -575,6 +575,9 @@ func (dec *Decoder) decodeMap(mtyp reflect.Type, state *decoderState, value refl
func (dec *Decoder) ignoreArrayHelper(state *decoderState, elemOp decOp, length int) {
instr := &decInstr{elemOp, 0, nil, errors.New("no error")}
for i := 0; i < length; i++ {
if state.b.Len() == 0 {
errorf("decoding array or slice: length exceeds input size (%d elements)", length)
}
elemOp(instr, state, noValue)
}
}

2
src/encoding/gob/encoder_test.go
View File

@ -953,6 +953,8 @@ var badDataTests = []badDataTest{
{"130a00fb5dad0bf8ff020263e70002fa28020202a89859", "slice length too large", nil},
{"0f1000fb285d003316020735ff023a65c5", "interface encoding", nil},
{"03fffb0616fffc00f902ff02ff03bf005d02885802a311a8120228022c028ee7", "GobDecoder", nil},
// Issue 10491.
{"10fe010f020102fe01100001fe010e000016fe010d030102fe010e00010101015801fe01100000000bfe011000f85555555555555555", "length exceeds input size", nil},
}
// TestBadData tests that various problems caused by malformed input