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From 66e7bd59520996740e4df5495a830b42fae48bc4 Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Wed, 11 Jan 2017 16:33:34 +0000
Subject: [PATCH] * libtiff/tif_read.c: avoid potential undefined behaviour on
signed integer addition in TIFFReadRawStrip1() in isMapped() case. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2650
Upstream-Status: Backport
CVE: CVE-2017-7602
Signed-off-by: Rajkumar Veer <rveer@mvista.com>
Index: tiff-4.0.7/ChangeLog
===================================================================
--- tiff-4.0.7.orig/ChangeLog 2017-04-25 18:42:07.656135638 +0530
+++ tiff-4.0.7/ChangeLog 2017-04-25 18:54:36.812147299 +0530
@@ -8,6 +8,12 @@
2017-01-11 Even Rouault <even.rouault at spatialys.com>
+ * libtiff/tif_read.c: avoid potential undefined behaviour on signed integer
+ addition in TIFFReadRawStrip1() in isMapped() case.
+ Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2650
+
+2017-01-11 Even Rouault <even.rouault at spatialys.com>
+
* libtiff/tif_jpeg.c: validate BitsPerSample in JPEGSetupEncode() to avoid
undefined behaviour caused by invalid shift exponent.
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2648
Index: tiff-4.0.7/libtiff/tif_read.c
===================================================================
--- tiff-4.0.7.orig/libtiff/tif_read.c 2017-04-25 18:42:07.132135629 +0530
+++ tiff-4.0.7/libtiff/tif_read.c 2017-04-25 18:58:25.272150855 +0530
@@ -420,16 +420,26 @@
return ((tmsize_t)(-1));
}
} else {
- tmsize_t ma,mb;
+ tmsize_t ma;
tmsize_t n;
- ma=(tmsize_t)td->td_stripoffset[strip];
- mb=ma+size;
- if ((td->td_stripoffset[strip] > (uint64)TIFF_TMSIZE_T_MAX)||(ma>tif->tif_size))
- n=0;
- else if ((mb<ma)||(mb<size)||(mb>tif->tif_size))
- n=tif->tif_size-ma;
- else
- n=size;
+ if ((td->td_stripoffset[strip] > (uint64)TIFF_TMSIZE_T_MAX)||
+ ((ma=(tmsize_t)td->td_stripoffset[strip])>tif->tif_size))
+ {
+ n=0;
+ }
+ else if( ma > TIFF_TMSIZE_T_MAX - size )
+ {
+ n=0;
+ }
+ else
+ {
+ tmsize_t mb=ma+size;
+ if (mb>tif->tif_size)
+ n=tif->tif_size-ma;
+ else
+ n=size;
+ }
+
if (n!=size) {
#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
TIFFErrorExt(tif->tif_clientdata, module,
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