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archive/tar: fix slice bounds out of range

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Sanity check the pax-header size field before using it.

Fixes #11167.

Change-Id: I9d5d0210c3990e6fb9434c3fe333be0d507d5962
Reviewed-on: https://go-review.googlesource.com/10954
Reviewed-by: David Symonds <dsymonds@golang.org>

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Michael Gehring 2015-06-12 22:49:42 +02:00 committed by Vincent Batts
parent 55dceefe42
commit 69de764807
2 changed files with 9 additions and 4 deletions
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2
archive/tar/reader.go
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@ -397,7 +397,7 @@ func parsePAX(r io.Reader) (map[string]string, error) {
}
// Parse the first token as a decimal integer.
n, err := strconv.ParseInt(string(buf[:sp]), 10, 0)
if err != nil {
if err != nil || n < 5 || int64(len(buf)) < n {
return nil, ErrHeader
}
// Extract everything between the decimal and the n -1 on the

11
archive/tar/reader_test.go
View file

@ -462,9 +462,14 @@ func TestParsePAXHeader(t *testing.T) {
t.Error("Buffer wasn't consumed")
}
}
badHeader := bytes.NewReader([]byte("3 somelongkey="))
if _, err := parsePAX(badHeader); err != ErrHeader {
t.Fatal("Unexpected success when parsing bad header")
badHeaderTests := [][]byte{
[]byte("3 somelongkey=\n"),
[]byte("50 tooshort=\n"),
}
for _, test := range badHeaderTests {
if _, err := parsePAX(bytes.NewReader(test)); err != ErrHeader {
t.Fatal("Unexpected success when parsing bad header")
}
}
}