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* libtiff/tif_color.c: TIFFYCbCrToRGBInit(): stricter clamping to avoid

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int32 overflow in TIFFYCbCrtoRGB().
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1844
Credit to OSS Fuzz
This commit is contained in:
Even Rouault 2017-05-29 10:12:54 +00:00
parent 84e1f1b66d
commit 2b3a489164
2 changed files with 11 additions and 4 deletions
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ChangeLog
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@ -1,3 +1,10 @@
2017-05-20 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
2017-05-21 Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
* configure.ac: libtiff 4.0.8 released.

8
libtiff/tif_color.c
View File

@ -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 @@ TIFFYCbCrToRGBInit(TIFFYCbCrToRGB* ycbcr, float *luma, float *refBlackWhite)
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 @@ TIFFYCbCrToRGBInit(TIFFYCbCrToRGB* ycbcr, float *luma, float *refBlackWhite)
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);
}
}