54 lines
1.7 KiB
Diff
54 lines
1.7 KiB
Diff
From be885a59b044553637289be4f6805e88782e52ef Mon Sep 17 00:00:00 2001
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From: erouault <erouault>
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Date: Wed, 11 Jan 2017 16:33:34 +0000
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Subject: [PATCH 8/8] * libtiff/tif_read.c: avoid potential undefined behaviour
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on signed integer addition in TIFFReadRawStrip1() in isMapped() case. Fixes
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http://bugzilla.maptools.org/show_bug.cgi?id=2650
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---
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libtiff/tif_read.c | 27 ++++++++++++++++++---------
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1 file changed, 18 insertions(+), 9 deletions(-)
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diff --git a/libtiff/tif_read.c b/libtiff/tif_read.c
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index f65bfab..60e5d03 100644
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--- a/libtiff/tif_read.c
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+++ b/libtiff/tif_read.c
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@@ -420,16 +420,25 @@ TIFFReadRawStrip1(TIFF* tif, uint32 strip, void* buf, tmsize_t size,
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return ((tmsize_t)(-1));
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}
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} else {
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- tmsize_t ma,mb;
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+ tmsize_t ma;
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tmsize_t n;
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- ma=(tmsize_t)td->td_stripoffset[strip];
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- mb=ma+size;
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- if ((td->td_stripoffset[strip] > (uint64)TIFF_TMSIZE_T_MAX)||(ma>tif->tif_size))
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- n=0;
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- else if ((mb<ma)||(mb<size)||(mb>tif->tif_size))
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- n=tif->tif_size-ma;
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- else
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- n=size;
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+ if ((td->td_stripoffset[strip] > (uint64)TIFF_TMSIZE_T_MAX)||
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+ ((ma=(tmsize_t)td->td_stripoffset[strip])>tif->tif_size))
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+ {
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+ n=0;
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+ }
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+ else if( ma > TIFF_TMSIZE_T_MAX - size )
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+ {
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+ n=0;
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+ }
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+ else
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+ {
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+ tmsize_t mb=ma+size;
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+ if (mb>tif->tif_size)
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+ n=tif->tif_size-ma;
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+ else
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+ n=size;
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+ }
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if (n!=size) {
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#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
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TIFFErrorExt(tif->tif_clientdata, module,
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--
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2.7.4
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