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Using an array to clamp translated YCbCr values is insecure, because if the
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TIFF file contains bogus ReferenceBlackWhite parameters, the computed RGB
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values could be very far out of range (much further than the current array
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size, anyway), possibly resulting in SIGSEGV. Just drop the whole idea in
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favor of using a comparison-based macro to clamp. See RH bug #583081.
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Filed upstream at http://bugzilla.maptools.org/show_bug.cgi?id=2208
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diff -Naur tiff-3.9.2.orig/libtiff/tif_color.c tiff-3.9.2/libtiff/tif_color.c
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--- tiff-3.9.2.orig/libtiff/tif_color.c 2006-02-09 10:42:20.000000000 -0500
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+++ tiff-3.9.2/libtiff/tif_color.c 2010-06-10 15:53:24.000000000 -0400
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@@ -183,13 +183,18 @@
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TIFFYCbCrtoRGB(TIFFYCbCrToRGB *ycbcr, uint32 Y, int32 Cb, int32 Cr,
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uint32 *r, uint32 *g, uint32 *b)
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{
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+ int32 i;
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+
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/* XXX: Only 8-bit YCbCr input supported for now */
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Y = HICLAMP(Y, 255), Cb = CLAMP(Cb, 0, 255), Cr = CLAMP(Cr, 0, 255);
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- *r = ycbcr->clamptab[ycbcr->Y_tab[Y] + ycbcr->Cr_r_tab[Cr]];
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- *g = ycbcr->clamptab[ycbcr->Y_tab[Y]
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- + (int)((ycbcr->Cb_g_tab[Cb] + ycbcr->Cr_g_tab[Cr]) >> SHIFT)];
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- *b = ycbcr->clamptab[ycbcr->Y_tab[Y] + ycbcr->Cb_b_tab[Cb]];
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+ i = ycbcr->Y_tab[Y] + ycbcr->Cr_r_tab[Cr];
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+ *r = CLAMP(i, 0, 255);
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+ i = ycbcr->Y_tab[Y]
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+ + (int)((ycbcr->Cb_g_tab[Cb] + ycbcr->Cr_g_tab[Cr]) >> SHIFT);
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+ *g = CLAMP(i, 0, 255);
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+ i = ycbcr->Y_tab[Y] + ycbcr->Cb_b_tab[Cb];
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+ *b = CLAMP(i, 0, 255);
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}
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/*
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