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archive/tar: don't panic on negative file size

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Fixes #10959.
Fixes #10960.

Change-Id: I9a81a0e2b8275338d0d1c3f7f7265e0fd91f3de2
Reviewed-on: https://go-review.googlesource.com/10402
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Symonds <dsymonds@golang.org>

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Håvard Haugen 2015-05-27 10:44:44 +02:00 • committed by Vincent Batts
parent 6e38573de2
commit 576b273762
3 changed files with 20 additions and 0 deletions
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4
archive/tar/reader.go
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@ -553,6 +553,10 @@ func (tr *Reader) readHeader() *Header {
hdr.Uid = int(tr.octal(s.next(8)))
hdr.Gid = int(tr.octal(s.next(8)))
hdr.Size = tr.octal(s.next(12))
if hdr.Size < 0 {
tr.err = ErrHeader
return nil
}
hdr.ModTime = time.Unix(tr.octal(s.next(12)), 0)
s.next(8) // chksum
hdr.Typeflag = s.next(1)[0]