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archive/tar: terminate when reading malformed sparse files

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Fixes #10968.

Change-Id: I027bc571a71629ac49c2a0ff101b2950af6e7531
Reviewed-on: https://go-review.googlesource.com/10482
Reviewed-by: David Symonds <dsymonds@golang.org>
Run-TryBot: David Symonds <dsymonds@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Håvard Haugen 2015-05-28 13:48:47 +02:00 • committed by Vincent Batts
parent 576b273762
commit 55dceefe42
3 changed files with 22 additions and 0 deletions
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3
archive/tar/reader.go
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@ -899,6 +899,9 @@ func (sfr *sparseFileReader) Read(b []byte) (n int, err error) {
// Otherwise, we're at the end of the file
return 0, io.EOF
}
if sfr.tot < sfr.sp[0].offset {
return 0, io.ErrUnexpectedEOF
}
if sfr.pos < sfr.sp[0].offset {
// We're in a hole
n = sfr.readHole(b, sfr.sp[0].offset)