36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
From 47f2fb61a3a64667bce1a8398a8fcb1b348ff122 Mon Sep 17 00:00:00 2001
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From: erouault <erouault>
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Date: Wed, 11 Jan 2017 12:15:01 +0000
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Subject: [PATCH] * libtiff/tif_jpeg.c: avoid integer division by zero in
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JPEGSetupEncode() when horizontal or vertical sampling is set to 0. Fixes
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http://bugzilla.maptools.org/show_bug.cgi?id=2653
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Fixes CVE-2017-7595
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Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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---
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libtiff/tif_jpeg.c | 7 +++++++
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1 file changed, 13 insertions(+)
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diff --git a/libtiff/tif_jpeg.c b/libtiff/tif_jpeg.c
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index 38595f98..6c17c388 100644
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--- a/libtiff/tif_jpeg.c
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+++ b/libtiff/tif_jpeg.c
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@@ -1626,6 +1626,13 @@ JPEGSetupEncode(TIFF* tif)
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case PHOTOMETRIC_YCBCR:
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sp->h_sampling = td->td_ycbcrsubsampling[0];
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sp->v_sampling = td->td_ycbcrsubsampling[1];
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+ if( sp->h_sampling == 0 || sp->v_sampling == 0 )
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+ {
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+ TIFFErrorExt(tif->tif_clientdata, module,
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+ "Invalig horizontal/vertical sampling value");
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+ return (0);
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+ }
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+
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/*
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* A ReferenceBlackWhite field *must* be present since the
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* default value is inappropriate for YCbCr. Fill in the
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--
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2.11.0
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