From ce5d91baa5df81f88161f3eb42b5dab7d829461c Mon Sep 17 00:00:00 2001 From: Adam Langley Date: Mon, 24 Jun 2013 10:59:41 -0400 Subject: [PATCH] compress/bzip2: don't panic on invalid input. Fixes 5747. R=golang-dev, r, bradfitz CC=golang-dev https://golang.org/cl/10401050 --- src/pkg/compress/bzip2/bzip2.go | 6 + src/pkg/compress/bzip2/bzip2_test.go | 164 +++++++++++++++++++++++++++ 2 files changed, 170 insertions(+) diff --git a/src/pkg/compress/bzip2/bzip2.go b/src/pkg/compress/bzip2/bzip2.go index 3dc8c62061..beeb8e1691 100644 --- a/src/pkg/compress/bzip2/bzip2.go +++ b/src/pkg/compress/bzip2/bzip2.go @@ -316,6 +316,9 @@ func (bz2 *reader) readBlock() (err error) { if repeat > 0 { // We have decoded a complete run-length so we need to // replicate the last output symbol. + if repeat > bz2.blockSize-bufIndex { + return StructuralError("repeats past end of block") + } for i := 0; i < repeat; i++ { b := byte(mtf.First()) bz2.tt[bufIndex] = uint32(b) @@ -339,6 +342,9 @@ func (bz2 *reader) readBlock() (err error) { // doesn't need to be encoded and we have |v-1| in the next // line. b := byte(mtf.Decode(int(v - 1))) + if bufIndex >= bz2.blockSize { + return StructuralError("data exceeds block size") + } bz2.tt[bufIndex] = uint32(b) bz2.c[b]++ bufIndex++ diff --git a/src/pkg/compress/bzip2/bzip2_test.go b/src/pkg/compress/bzip2/bzip2_test.go index 1a988382c4..530719160c 100644 --- a/src/pkg/compress/bzip2/bzip2_test.go +++ b/src/pkg/compress/bzip2/bzip2_test.go @@ -6,6 +6,7 @@ package bzip2 import ( "bytes" + "encoding/base64" "encoding/hex" "io" "io/ioutil" @@ -184,3 +185,166 @@ func benchmarkDecode(b *testing.B, testfile int) { func BenchmarkDecodeDigits(b *testing.B) { benchmarkDecode(b, digits) } func BenchmarkDecodeTwain(b *testing.B) { benchmarkDecode(b, twain) } + +func TestBufferOverrun(t *testing.T) { + // Tests https://code.google.com/p/go/issues/detail?id=5747. + buffer := bytes.NewBuffer([]byte(bufferOverrunBase64)) + decoder := base64.NewDecoder(base64.StdEncoding, buffer) + decompressor := NewReader(decoder) + // This shouldn't panic. + ioutil.ReadAll(decompressor) +} + +var bufferOverrunBase64 string = ` 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