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image/jpeg: accept "\xff\x00" before a RST marker
Fixes #28717 Change-Id: I0a1e4ef1583fff89b6f46ef647fb6e4499bdf999 Reviewed-on: https://go-review.googlesource.com/c/go/+/230122 Run-TryBot: Nigel Tao <nigeltao@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
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@ -6,6 +6,7 @@ package jpeg
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"image"
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"image/color"
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@ -262,6 +263,175 @@ func TestLargeImageWithShortData(t *testing.T) {
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}
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}
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func TestPaddedRSTMarker(t *testing.T) {
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// This test image comes from golang.org/issue/28717
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const base64EncodedImage = `
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/9j/4AAhQVZJMQABAQEAeAB4AAAAAAAAAAAAAAAAAAAAAAAAAP/bAEMABAIDAwMCBAMDAwQEBAQGCgYG
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BQUGDAgJBwoODA8PDgwODxASFxMQERURDQ4UGhQVFxgZGhkPExweHBkeFxkZGP/bAEMBBAQEBgUGCwYG
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RJspa7kjAFmwOp6Y9qSXPyDtkVgnsa9yFxhWYrj2rJUtJcFgB75rqpSvc5K0bWSRetV2Rg98c8d6UZCs
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M8AZPNTLWTuVFWiiIgjcBnDY5NToCsZAyDnqKUrtJDitWUfETbYI1Ixz7ZNYkXyzMAMevHSuvDfCceK3
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||||
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6aM9ajmM6SSlqj//1/DIOpHGaljG4cYH4V+e62PtWEi45pvzcjIwKuLsS9RYwM9s1Jj5Md88molqUnYl
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||||
Xlue1SryKlpodiWLGB6GpBWU9FcEPQd6eBgjNRYpCn7opDyM0Ru9RMQdxxzSODVR12F6mTryFrWVcfeU
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j9K82ctvxxXrZY7XRjiF7qEjUHgkYFQuuCeB19K9dO5xSSsf/9D44uwSmM556VXkXMJHGenFeZTvoexN
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Ilg4bBOTjrip5uQcY4x2qJ3ckVDSLQ6MdCPpT4uGIHGOaze1jRJbkjFgDgYpjEgqxI7dqyWhpuQ3rkQS
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HjpWfaR9/wCf1rqp6RZy1Peki8MGMfNx7d6jc7Yyc4ye1JptjvorjBneDw2QMVPEHBIOFwR3qbXF5ox/
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||||
br37VMuT9TX55HY+ze+gMM5PSkzwR1AoWu4IRRg9akPC8HpSlfRFLXYeCN3TkipV60ulmBJGeR71IvTP
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||||
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||||
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||||
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||||
vxrWemxlTZCvMe4BTg/nSRKHVsjGfpSe90C1VmTsG2H2x3rF1J1eVxgcHr+FVQWtyK7srFGAgOrHqDnp
|
||||
7VPGNzO/O3kkCut7pnGno0idCCNyt6Crca5ZiDjpgVzXsnc6X71rDyBgcbtucn8KhjBMpOfrz7VlTdtT
|
||||
Sqm7JH//2Q==
|
||||
`
|
||||
|
||||
data, err := base64.StdEncoding.DecodeString(base64EncodedImage)
|
||||
if err != nil {
|
||||
t.Fatalf("base64 DecodeString: %v", err)
|
||||
}
|
||||
if _, err = Decode(bytes.NewReader(data)); err != nil {
|
||||
t.Fatalf("Decode: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestExtraneousData(t *testing.T) {
|
||||
// Encode a 1x1 red image.
|
||||
src := image.NewRGBA(image.Rect(0, 0, 1, 1))
|
||||
|
@ -310,6 +310,25 @@ func (d *decoder) processSOS(n int) error {
|
||||
if err := d.readFull(d.tmp[:2]); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Section F.1.2.3 says that "Byte alignment of markers is
|
||||
// achieved by padding incomplete bytes with 1-bits. If padding
|
||||
// with 1-bits creates a X’FF’ value, a zero byte is stuffed
|
||||
// before adding the marker."
|
||||
//
|
||||
// Seeing "\xff\x00" here is not spec compliant, as we are not
|
||||
// expecting an *incomplete* byte (that needed padding). Still,
|
||||
// some real world encoders (see golang.org/issue/28717) insert
|
||||
// it, so we accept it and re-try the 2 byte read.
|
||||
//
|
||||
// libjpeg issues a warning (but not an error) for this:
|
||||
// https://github.com/LuaDist/libjpeg/blob/6c0fcb8ddee365e7abc4d332662b06900612e923/jdmarker.c#L1041-L1046
|
||||
if d.tmp[0] == 0xff && d.tmp[1] == 0x00 {
|
||||
if err := d.readFull(d.tmp[:2]); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
if d.tmp[0] != 0xff || d.tmp[1] != expectedRST {
|
||||
return FormatError("bad RST marker")
|
||||
}
|
||||
|
Loading…
x
Reference in New Issue
Block a user