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proto: fix uint64->int overflow in table unmarshal #461

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merged 3 commits into from
Nov 29, 2017
Merged

proto: fix uint64->int overflow in table unmarshal #461

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a2fb0a9
proto: fix uint64->int overflow in table unmarshal
neild Nov 29, 2017
cddfb72
avoid overflow on addition, as well as uint64->int conversion
neild Nov 29, 2017
acfffe7
Merge branch 'fuzz' of github.com:neild/protobuf into fuzz
neild Nov 29, 2017
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10 changes: 9 additions & 1 deletion proto/all_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1306,7 +1306,7 @@ func (*NNIMessage) Reset() {}
func (*NNIMessage) String() string { return "" }
func (*NNIMessage) ProtoMessage() {}

type NMMessage struct {}
type NMMessage struct{}

func (*NMMessage) Reset() {}
func (*NMMessage) String() string { return "" }
Expand Down Expand Up @@ -1505,6 +1505,14 @@ func TestVarintOverflow(t *testing.T) {
}
}

func TestBytesWithInvalidLengthInGroup(t *testing.T) {
// Overflowing a 64-bit length should not be allowed.
b := []byte{0xbb, 0x30, 0xb2, 0x30, 0xb0, 0xb2, 0x83, 0xf1, 0xb0, 0xb2, 0xef, 0xbf, 0xbd, 0x01}
if err := Unmarshal(b, new(MyMessage)); err == nil {
t.Fatalf("Overflowed uint64 length without error")
}
}

func TestUnmarshalFuzz(t *testing.T) {
const N = 1000
seed := time.Now().UnixNano()
Expand Down
8 changes: 4 additions & 4 deletions proto/table_unmarshal.go
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Original file line number Diff line number Diff line change
Expand Up @@ -208,7 +208,7 @@ func (u *unmarshalInfo) unmarshal(m pointer, b []byte) error {
b = b[8:]
case WireBytes:
m, k := decodeVarint(b)
if k == 0 || uint64(len(b)) < uint64(k)+m {
if k == 0 || uint64(len(b)-k) < m {
return io.ErrUnexpectedEOF
}
b = b[uint64(k)+m:]
Expand Down Expand Up @@ -1834,12 +1834,12 @@ func findEndGroup(b []byte) (int, int) {
}
i += k
case WireFixed32:
if i+4 > len(b) {
if len(b)-4 < i {
return -1, -1
}
i += 4
case WireFixed64:
if i+8 > len(b) {
if len(b)-8 < i {
return -1, -1
}
i += 8
Expand All @@ -1849,7 +1849,7 @@ func findEndGroup(b []byte) (int, int) {
return -1, -1
}
i += k
if i+int(m) > len(b) {
if uint64(len(b)-i) < m {
return -1, -1
}
i += int(m)
Expand Down