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From 5083c41f3a6824f392adf3a6dce1548afded4211 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Wed, 11 Jan 2017 12:15:01 +0000
Subject: [PATCH] * libtiff/tif_jpeg.c: avoid integer division by zero in
JPEGSetupEncode() when horizontal or vertical sampling is set to 0. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2653
---
ChangeLog | 6 ++++++
libtiff/tif_jpeg.c | 9 ++++++++-
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/libtiff/tif_jpeg.c b/libtiff/tif_jpeg.c
index dc4364c821a4..09ef4949f9ee 100644
--- a/libtiff/tif_jpeg.c
+++ b/libtiff/tif_jpeg.c
@@ -1626,6 +1626,13 @@ JPEGSetupEncode(TIFF* tif)
case PHOTOMETRIC_YCBCR:
sp->h_sampling = td->td_ycbcrsubsampling[0];
sp->v_sampling = td->td_ycbcrsubsampling[1];
+ if( sp->h_sampling == 0 || sp->v_sampling == 0 )
+ {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Invalig horizontal/vertical sampling value");
+ return (0);
+ }
+
/*
* A ReferenceBlackWhite field *must* be present since the
* default value is inappropriate for YCbCr. Fill in the
--
2.12.0
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