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From c682ee1d269b85c54202c04a9a5afb9737e75416 Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Wed, 11 Jan 2017 13:28:01 +0000
Subject: [PATCH 6/8] * libtiff/tif_dirread.c: avoid division by floating point
0 in TIFFReadDirEntryCheckedRational() and
TIFFReadDirEntryCheckedSrational(), and return 0 in that case (instead of
infinity as before presumably) Apparently some sanitizers do not like those
divisions by zero. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2644
---
libtiff/tif_dirread.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
index 7d1d194..32aabe6 100644
--- a/libtiff/tif_dirread.c
+++ b/libtiff/tif_dirread.c
@@ -2880,7 +2880,10 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryCheckedRational(TIFF* tif, TIFFD
m.l = direntry->tdir_offset.toff_long8;
if (tif->tif_flags&TIFF_SWAB)
TIFFSwabArrayOfLong(m.i,2);
- if (m.i[0]==0)
+ /* Not completely sure what we should do when m.i[1]==0, but some */
+ /* sanitizers do not like division by 0.0: */
+ /* http://bugzilla.maptools.org/show_bug.cgi?id=2644 */
+ if (m.i[0]==0 || m.i[1]==0)
*value=0.0;
else
*value=(double)m.i[0]/(double)m.i[1];
@@ -2908,7 +2911,10 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryCheckedSrational(TIFF* tif, TIFF
m.l=direntry->tdir_offset.toff_long8;
if (tif->tif_flags&TIFF_SWAB)
TIFFSwabArrayOfLong(m.i,2);
- if ((int32)m.i[0]==0)
+ /* Not completely sure what we should do when m.i[1]==0, but some */
+ /* sanitizers do not like division by 0.0: */
+ /* http://bugzilla.maptools.org/show_bug.cgi?id=2644 */
+ if ((int32)m.i[0]==0 || m.i[1]==0)
*value=0.0;
else
*value=(double)((int32)m.i[0])/(double)m.i[1];
--
2.7.4
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