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Fix an integer overflow TIFFYCbCrtoRGB():
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1844
3rd party Git reference:
https://github.com/vadz/libtiff/commit/02669064e927074819ce1ed39aba0fccaa167717
2017-05-29 Even Rouault <even.rouault at spatialys.com>
* libtiff/tif_color.c: TIFFYCbCrToRGBInit(): stricter clamping to avoid
int32 overflow in TIFFYCbCrtoRGB().
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1844
Credit to OSS Fuzz
/cvs/maptools/cvsroot/libtiff/ChangeLog,v <-- ChangeLog
new revision: 1.1241; previous revision: 1.1240
/cvs/maptools/cvsroot/libtiff/libtiff/tif_color.c,v <-- libtiff/tif_color.c
new revision: 1.24; previous revision: 1.23
Index: libtiff/libtiff/tif_color.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_color.c,v
retrieving revision 1.23
retrieving revision 1.24
diff -u -r1.23 -r1.24
--- libtiff/libtiff/tif_color.c 13 May 2017 18:17:34 -0000 1.23
+++ libtiff/libtiff/tif_color.c 29 May 2017 10:12:54 -0000 1.24
@@ -1,4 +1,4 @@
-/* $Id: tif_color.c,v 1.23 2017-05-13 18:17:34 erouault Exp $ */
+/* $Id: tif_color.c,v 1.24 2017-05-29 10:12:54 erouault Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@@ -275,10 +275,10 @@
for (i = 0, x = -128; i < 256; i++, x++) {
int32 Cr = (int32)CLAMPw(Code2V(x, refBlackWhite[4] - 128.0F,
refBlackWhite[5] - 128.0F, 127),
- -128.0F * 64, 128.0F * 64);
+ -128.0F * 32, 128.0F * 32);
int32 Cb = (int32)CLAMPw(Code2V(x, refBlackWhite[2] - 128.0F,
refBlackWhite[3] - 128.0F, 127),
- -128.0F * 64, 128.0F * 64);
+ -128.0F * 32, 128.0F * 32);
ycbcr->Cr_r_tab[i] = (int32)((D1*Cr + ONE_HALF)>>SHIFT);
ycbcr->Cb_b_tab[i] = (int32)((D3*Cb + ONE_HALF)>>SHIFT);
@@ -286,7 +286,7 @@
ycbcr->Cb_g_tab[i] = D4*Cb + ONE_HALF;
ycbcr->Y_tab[i] =
(int32)CLAMPw(Code2V(x + 128, refBlackWhite[0], refBlackWhite[1], 255),
- -128.0F * 64, 128.0F * 64);
+ -128.0F * 32, 128.0F * 32);
}
}
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